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Other names | ZK-230211; BAY 86-5044; ZK-PRA; 11β-(4-acetylphenyl)-17β-hydroxy-17α-(1,1,2,2,2-pentafluoroethyl)estra-4,9-dien-3-one |
Routes of administration | Oral |
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ECHA InfoCard | 100.190.674 |
Chemical and physical data | |
Formula | C28H29F5O3 |
Molar mass | 508.529 g·mol−1 |
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Lonaprisan (INN, USAN) (developmental code names ZK-230211, BAY 86-5044, ZK-PRA) is a synthetic, steroidal antiprogestogen which was under development by Bayer HealthCare Pharmaceuticals for the treatment of endometriosis, dysmenorrhea, and breast cancer but was discontinued.[1][2][3] It is a potent and highly selective silent antagonist of the progesterone receptor (PR).[2][3][4] The drug reached phase II clinical trials prior to its discontinuation.[1]