![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_fe3f92a2cc3d499742993c6ba3abb5e6.svg) | Rolipram | IC50 | 860.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_fe3f92a2cc3d499742993c6ba3abb5e6.svg) | Rolipram | Ki | 4.5 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_eb9db9b84b76fbcd81744f1acddb03dc.svg) | Piclamilast | IC50 | 1.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_eb9db9b84b76fbcd81744f1acddb03dc.svg) | Piclamilast | Ki | 0.85 [1], 1.0 [2], 1.5 [3] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_fac02fc38056dabaf3130f9076a3bc63.svg) | Cilomilast | IC50 | 100.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_fac02fc38056dabaf3130f9076a3bc63.svg) | Cilomilast | Ki | 38.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_ce2451a6dd9c86e3ec85025ead605266.svg) | Sildenafil | IC50 | 8300.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_91a766c61380d2e8ae304016ae944d59.svg) | 5-Cyclopentyloxy-1-(3,5-dichloropyridin-4-ylmethyl)-6-methoxy-phthalazine | IC50 | 52.48 [1], 53.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_91a766c61380d2e8ae304016ae944d59.svg) | 5-Cyclopentyloxy-1-(3,5-dichloropyridin-4-ylmethyl)-6-methoxy-phthalazine | Ki | 149.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_498600de77801844019dd25a5605e657.svg) | 4-(2-(3-(Cyclopentyloxy)-4-methoxyphenyl)-2-phenylethyl)pyridine | IC50 | 19.95 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_498600de77801844019dd25a5605e657.svg) | 4-(2-(3-(Cyclopentyloxy)-4-methoxyphenyl)-2-phenylethyl)pyridine | Ki | 60.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_29f872b26cb31380c7e625ee9fa67f34.svg) | Theophylline | IC50 | 81000.0 [1], 1780000.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_29f872b26cb31380c7e625ee9fa67f34.svg) | Theophylline | Ki | 56800.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_d71d71dab266a4f57b96f29fbaa48aed.svg) | Amrinone | IC50 | 41000.0 [1], 101000.0 [2], 126000.0 [3], 150000.0 [4] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_1b6f778cc12dda22e42b17d5f7c22c74.svg) | (R)-(-)-Rolipram | IC50 | 50.12 [1], 300.0 [2], 1400.0 [3] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_602ffc7429097215cfe38917d302d660.svg) | Unii-G6gso9sdnj | IC50 | 0.16 [1], 1.0 [2], 11.0 [3], 160.0 [4] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_3e310e0db0c24e6c0ab4d41be9a3445d.svg) | CID 10125445 | IC50 | 794.33 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_3e310e0db0c24e6c0ab4d41be9a3445d.svg) | CID 10125445 | Ki | 5011.87 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_12b313662779e4c1c55010b8dab41ef5.svg) | 1-(3,5-Dichloro-pyridin-4-ylmethyl)-6-methoxy-4-[1,2,4]triazol-1-yl-phthalazine | IC50 | 239.88 [1], 241.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_12b313662779e4c1c55010b8dab41ef5.svg) | 1-(3,5-Dichloro-pyridin-4-ylmethyl)-6-methoxy-4-[1,2,4]triazol-1-yl-phthalazine | Ki | 383.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_19bfdaa4eade6c61f1ad356847bbcc7c.svg) | (5-Cyclopentyloxy-6-methoxy-phthalazin-1-yl)-(3,5-dichloro-pyridin-4-yl)-amine | IC50 | 58.88 [1], 59.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_19bfdaa4eade6c61f1ad356847bbcc7c.svg) | (5-Cyclopentyloxy-6-methoxy-phthalazin-1-yl)-(3,5-dichloro-pyridin-4-yl)-amine | Ki | 95.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_f93ba95d8525b1cad721c4da317721ab.svg) | 8-Cyclopentyloxy-4-[(3,5-dichloropyridin-4-yl)methyl]-7-methoxy-2-methylsulfonyl-1H-phthalazine | IC50 | 2.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_f93ba95d8525b1cad721c4da317721ab.svg) | 8-Cyclopentyloxy-4-[(3,5-dichloropyridin-4-yl)methyl]-7-methoxy-2-methylsulfonyl-1H-phthalazine | Ki | 5.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_3c89fb3375c080977d7b8b9ab8ab7d7d.svg) | (3Ar,6aS)-5-cyano-5-(3-cyclopentyloxy-4-methoxyphenyl)-2,3,3a,4,6,6a-hexahydro-1H-pentalene-2-carboxylic acid | IC50 | 9.0 [1], 150.0 [2], 300.0 [3] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_6b169db73cb7bc9b7ca9ea14767e10cd.svg) | 1-(Cyclohexylmethyl)-N-(3,5-dichloropyridin-4-yl)-3-methylindole-6-carboxamide | IC50 | 100.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_6b169db73cb7bc9b7ca9ea14767e10cd.svg) | 1-(Cyclohexylmethyl)-N-(3,5-dichloropyridin-4-yl)-3-methylindole-6-carboxamide | Ki | 120.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_122ddf523597ef49a20c81614981fb9a.svg) | 1-Benzyl-N-(3,5-dichloropyridin-4-yl)-3-methylindole-6-carboxamide | IC50 | 18.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_122ddf523597ef49a20c81614981fb9a.svg) | 1-Benzyl-N-(3,5-dichloropyridin-4-yl)-3-methylindole-6-carboxamide | Ki | 135.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_a4afce3e7571433956a38383b1f2d071.svg) | 1-(3,5-Dichloro-pyridin-4-ylmethyl)-6-methoxy-4-phenoxy-phthalazine | IC50 | 131.83 [1], 132.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_a4afce3e7571433956a38383b1f2d071.svg) | 1-(3,5-Dichloro-pyridin-4-ylmethyl)-6-methoxy-4-phenoxy-phthalazine | Ki | 436.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_9b684ea2b8430200014d737c79238dc6.svg) | 1-(3,5-Dichloro-pyridin-4-ylmethyl)-4-ethynyl-6-methoxy-phthalazine | IC50 | 93.0 [1], 93.33 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_9b684ea2b8430200014d737c79238dc6.svg) | 1-(3,5-Dichloro-pyridin-4-ylmethyl)-4-ethynyl-6-methoxy-phthalazine | Ki | 204.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_6a86c5ad44eb00b10021e286c5d94ad8.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-5-(5-phenylpentyl)-6-methoxyphthalazine | IC50 | 30.0 [1], 30.2 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_6a86c5ad44eb00b10021e286c5d94ad8.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-5-(5-phenylpentyl)-6-methoxyphthalazine | Ki | 320.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_8392651b171ba406901ad3d264b8f540.svg) | Ethyl 2-[4-[(3,5-dichloropyridin-4-yl)methyl]-7-methoxy-1H-phthalazin-2-yl]-2-oxoacetate | IC50 | 112.2 [1], 113.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_8392651b171ba406901ad3d264b8f540.svg) | Ethyl 2-[4-[(3,5-dichloropyridin-4-yl)methyl]-7-methoxy-1H-phthalazin-2-yl]-2-oxoacetate | Ki | 212.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_6fafe9f5fa9dc74c7b3484b14f8db214.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-5-(5-phenyl-1-pentynyl)-6-methoxyphthalazine | IC50 | 10.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_6fafe9f5fa9dc74c7b3484b14f8db214.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-5-(5-phenyl-1-pentynyl)-6-methoxyphthalazine | Ki | 71.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_431b1a90622342cf364b7e51ddae7788.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-3-acetyl-6-methoxy-3,4-dihydrophthalazine | IC50 | 51.0 [1], 51.29 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_431b1a90622342cf364b7e51ddae7788.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-3-acetyl-6-methoxy-3,4-dihydrophthalazine | Ki | 397.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_b34f0b75f909dc49c44955b98f03a35c.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-5-(5-phenyl-1-pentenyl)-6-methoxyphthalazine | IC50 | 19.0 [1], 19.05 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_b34f0b75f909dc49c44955b98f03a35c.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-5-(5-phenyl-1-pentenyl)-6-methoxyphthalazine | Ki | 164.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_7ff56ac85cedef5d579a4db0ad453213.svg) | 1-(3,5-Dichloropyridin-4-ylmethyl)-6-methoxy-4-pyrrolidin-1-yl-phthalazine | IC50 | 38.0 [1], 38.02 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_7ff56ac85cedef5d579a4db0ad453213.svg) | 1-(3,5-Dichloropyridin-4-ylmethyl)-6-methoxy-4-pyrrolidin-1-yl-phthalazine | Ki | 89.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_1b4843fdf95efdd93454d891df91118d.svg) | 5-Cyclopentyloxy-1-[(3,5-dichloropyridin-4-yl)methyl]-6-methoxy-3-oxidophthalazin-3-ium | IC50 | 41.69 [1], 42.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_1b4843fdf95efdd93454d891df91118d.svg) | 5-Cyclopentyloxy-1-[(3,5-dichloropyridin-4-yl)methyl]-6-methoxy-3-oxidophthalazin-3-ium | Ki | 121.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_61dcddf066315cc93ff3b3e13b195a89.svg) | 4-[(3,5-Dichloropyridin-4-yl)methyl]-7-methoxy-N-methyl-1H-phthalazine-2-carboxamide | IC50 | 131.0 [1], 131.83 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_61dcddf066315cc93ff3b3e13b195a89.svg) | 4-[(3,5-Dichloropyridin-4-yl)methyl]-7-methoxy-N-methyl-1H-phthalazine-2-carboxamide | Ki | 235.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_19499f02cc78cdff18407cdaf0a2bca8.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-6-methoxy-3,4-dihydrophthalazine-3-carboxamide | IC50 | 36.0 [1], 36.31 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_19499f02cc78cdff18407cdaf0a2bca8.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-6-methoxy-3,4-dihydrophthalazine-3-carboxamide | Ki | 63.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_e13cabd0192b4aa7f62a75776964177a.svg) | 4-[(3,5-Dichloropyridin-4-yl)methyl]-N-hydroxy-7-methoxy-1H-phthalazine-2-carboxamide | IC50 | 85.0 [1], 85.11 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_e13cabd0192b4aa7f62a75776964177a.svg) | 4-[(3,5-Dichloropyridin-4-yl)methyl]-N-hydroxy-7-methoxy-1H-phthalazine-2-carboxamide | Ki | 208.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_950b6a20db60a5fb55629a72eec15028.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-3-acetyl-5-(cyclopentyloxy)-6-methoxy-3,4-dihydrophthalazine | IC50 | 30.0 [1], 30.2 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_950b6a20db60a5fb55629a72eec15028.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-3-acetyl-5-(cyclopentyloxy)-6-methoxy-3,4-dihydrophthalazine | Ki | 128.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_7dc4bee6b6e9038c0fcaa55718b501d3.svg) | 2-[4-[(3,5-Dichloro-1-oxidopyridin-1-ium-4-yl)methyl]-7-methoxyphthalazin-1-yl]-1,3-thiazole | IC50 | 3.98 [1], 4.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_7dc4bee6b6e9038c0fcaa55718b501d3.svg) | 2-[4-[(3,5-Dichloro-1-oxidopyridin-1-ium-4-yl)methyl]-7-methoxyphthalazin-1-yl]-1,3-thiazole | Ki | 17.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_a76d0cdf2ab718e9c2bce25750b40f84.svg) | 4-[(3,5-Dichloropyridin-4-yl)methyl]-7-methoxy-2-methylsulfonyl-1H-phthalazine | IC50 | 20.89 [1], 21.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_a76d0cdf2ab718e9c2bce25750b40f84.svg) | 4-[(3,5-Dichloropyridin-4-yl)methyl]-7-methoxy-2-methylsulfonyl-1H-phthalazine | Ki | 60.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_2bc28194a72d3374907cb07e8e2fba3f.svg) | 1-(3,5-Dichloro-4-pyridylmethyl)-4-(2-thiazolyl)-6-methoxyphthalazine | IC50 | 14.0 [1], 14.13 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_2bc28194a72d3374907cb07e8e2fba3f.svg) | 1-(3,5-Dichloro-4-pyridylmethyl)-4-(2-thiazolyl)-6-methoxyphthalazine | Ki | 34.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_fccf6fa5d4d339c1f3850d6ae2571064.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-5-(cyclopentyloxy)-6-(difluoromethoxy)phthalazine | IC50 | 38.9 [1], 39.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_fccf6fa5d4d339c1f3850d6ae2571064.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-5-(cyclopentyloxy)-6-(difluoromethoxy)phthalazine | Ki | 46.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_83604be42e2ca14f6c55b4ee630e6dd0.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-5-(5-phenylpentoxy)-6-methoxyphthalazine | IC50 | 56.23 [1], 57.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_83604be42e2ca14f6c55b4ee630e6dd0.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-5-(5-phenylpentoxy)-6-methoxyphthalazine | Ki | 13.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_6cb9e9c5ebbd444bee7a59c565792dfb.svg) | 1-[4-(3,5-Dichloro-pyridin-4-ylmethyl)-7-methoxy-1H-phthalazin-2-yl]-2-methyl-propan-1-one | IC50 | 25.0 [1], 25.12 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_6cb9e9c5ebbd444bee7a59c565792dfb.svg) | 1-[4-(3,5-Dichloro-pyridin-4-ylmethyl)-7-methoxy-1H-phthalazin-2-yl]-2-methyl-propan-1-one | Ki | 498.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_bc70fb94c93c9d60e28c5bb454b1f20c.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-5-(indan-2-yloxy)-6-methoxyphthalazine | IC50 | 30.0 [1], 30.2 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_bc70fb94c93c9d60e28c5bb454b1f20c.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-5-(indan-2-yloxy)-6-methoxyphthalazine | Ki | 16.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_86e8ab9e2a22bd3c0e7e46eda8199e93.svg) | 1-[4-(3,5-Dichloro-pyridin-4-ylmethyl)-7-methoxy-1H-phthalazin-2-yl]-propan-1-one | IC50 | 28.0 [1], 28.18 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_86e8ab9e2a22bd3c0e7e46eda8199e93.svg) | 1-[4-(3,5-Dichloro-pyridin-4-ylmethyl)-7-methoxy-1H-phthalazin-2-yl]-propan-1-one | Ki | 237.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_de9a2408f0e856f489ad68e69a088a58.svg) | 1-(3,5-Dichloro-4-pyridylmethyl)-4-morpholino-6-methoxyphthalazine | IC50 | 131.83 [1], 132.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_de9a2408f0e856f489ad68e69a088a58.svg) | 1-(3,5-Dichloro-4-pyridylmethyl)-4-morpholino-6-methoxyphthalazine | Ki | 452.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_8267a37607194a50739e19a7ae8221e2.svg) | 4-(3,5-Dichloro-pyridin-4-ylmethyl)-7-methoxy-1H-phthalazine-2-carboxylic acid methyl ester | IC50 | 72.0 [1], 72.44 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_8267a37607194a50739e19a7ae8221e2.svg) | 4-(3,5-Dichloro-pyridin-4-ylmethyl)-7-methoxy-1H-phthalazine-2-carboxylic acid methyl ester | Ki | 199.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_a9b6dc8aa126d20f1c2274ed9f72d972.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-4-phenyl-6-methoxyphthalazine | IC50 | 37.0 [1], 37.15 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_a9b6dc8aa126d20f1c2274ed9f72d972.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-4-phenyl-6-methoxyphthalazine | Ki | 271.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_d5acf14edd801997cc60f881c472e336.svg) | 2-[4-[2,3-Bis(hydroxymethyl)-6,7-dimethoxynaphthalen-1-yl]pyridin-2-yl]-4-pyridin-3-ylphthalazin-1-one | IC50 | 0.63 [1], 0.7 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_d5acf14edd801997cc60f881c472e336.svg) | 2-[4-[2,3-Bis(hydroxymethyl)-6,7-dimethoxynaphthalen-1-yl]pyridin-2-yl]-4-pyridin-3-ylphthalazin-1-one | Ki | 3.5 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_4a2f7aa95b8e5fa8d1122874409c701a.svg) | Tadalafil | IC50 | 9200.0 [1], 10000.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_f2c1c04ef0787963213517a6b0b2b31c.svg) | Zaprinast | IC50 | 10000.0 [1], 53000.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_89656bbdc2d40342529d0f1aee95eb3f.svg) | Enoximone | IC50 | 2900.0 [1], 5000.0 [2], 150000.0 [3] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_f279a08ed16335ac7dd922ae328f130a.svg) | Roflumilast | IC50 | 0.3 [1], 0.8 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_b12e5f0bc97c098ef64ad34f70617967.svg) | Zardaverine | IC50 | 158.49 [1], 800.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_51bf0d35f0c8406deae34c837825e488.svg) | Denbufylline | IC50 | 0.17 [1], 170.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_51bf0d35f0c8406deae34c837825e488.svg) | Denbufylline | Ki | 44900.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_3e0d14e80d459fe9df62dcc4d0d02418.svg) | N-(3,5-Dichloro-1-oxido-4-pyridinyl)-8-methoxy-2-(trifluoromethyl)-5-quinoline carboxamide | IC50 | 59.98 [1], 60.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_1dd255693ba018b7770c6db0deff08e4.svg) | N-(3,5-Dichloropyridin-4-yl)-8-methoxy-2-(trifluoromethyl)quinoline-5-carboxamide | IC50 | 51.0 [1], 51.05 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_63871d4030b8f0b33da51e76aaff268a.svg) | CI-1018 | IC50 | 1100.0 [1], 1140.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_aee5ba6677c807e013ca50ffded72e1e.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-3-benzoyl-6-methoxy-3,4-dihydrophthalazine | IC50 | 30.0 [1], 30.2 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_707302abddd50f3a4c1bcc2f634c2234.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-6-methoxy-7-(cyclopentyloxy)phthalazine | IC50 | 186.0 [1], 186.21 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_e2b3455e2e15c8bd9a5b8872d5749771.svg) | 2-[4-[3-(Hydroxymethyl)-6,7-dimethoxynaphthalen-1-yl]pyridin-2-yl]-4-pyridin-3-ylphthalazin-1-one;hydrochloride | IC50 | 0.7 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_e2b3455e2e15c8bd9a5b8872d5749771.svg) | 2-[4-[3-(Hydroxymethyl)-6,7-dimethoxynaphthalen-1-yl]pyridin-2-yl]-4-pyridin-3-ylphthalazin-1-one;hydrochloride | Ki | 3.0 [1] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_2693bd21c2b2e0d9e50041463f1cceb3.svg) | 2-Acetyl-N-(3,5-dichloropyridin-4-yl)-7-methoxy-1-benzofuran-4-carboxamide | IC50 | 1.0 [1], 1.6 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_ee8aa45ea01063751fc6c444920809a7.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-3-(phenylacetyl)-6-methoxy-3,4-dihydrophthalazine | IC50 | 12.0 [1], 12.02 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_45d81b3f66b5f8aa9f9058451afdea9d.svg) | 1-(3,5-Dichloro-4-pyridinylmethyl)-4-(phenylethynyl)-6-methoxyphthalazine | IC50 | 47.86 [1], 48.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_c413f057aaef9fb6cf691ecbf43c2138.svg) | Bcamp | IC50 | 7700.0 [1], 40000.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_611aee8360ba5f29cd9711190dfe1482.svg) | Vardenafil | IC50 | 3800.0 [1], 4500.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_0b6fb2d0f29e153104477c9063db1598.svg) | 8-(4-Chlorophenylthio)-cAMP | IC50 | 22000.0 [1], 200000.0 [2] |
![](https://images.aatbio.com/dataset/ic50/phosphodiesterase-4_995eee843180fa94f19222bf69596b41.svg) | 4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinone | IC50 | 4800.0 [1], 26000.0 [2] |