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| Other names | Zuclomiphene; trans-Clomifene; Transclomiphene; (Z)-Clomifene; ICI-46476; RMI-16312; Zuclomifene citrate; Zuclomiphene citrate |
| Routes of administration | Oral |
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| Chemical and physical data | |
| Formula | C26H28ClNO |
| Molar mass | 405.97 g·mol−1 |
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Zuclomifene (INN; or zuclomiphene (USAN)) is a nonsteroidal selective estrogen receptor modulator (SERM) of the triphenylethylene group that was never marketed. [1] [2] [3] [4] It is one of the two stereoisomers of clomifene, which itself is a mixture of 38% zuclomifene and 62% enclomifene. [4] Zuclomifene is the (Z)-stereoisomer of clomifene, while enclomifene is the (E)-stereoisomer. [1] [2] Whereas zuclomifene is described as mildly estrogenic, enclomifene is described as antiestrogenic. [4] [5] In accordance, unlike enclomifene, zuclomifene is antigonadotropic due to activation of the estrogen receptor and reduces testosterone levels in men. [4] It is also about five times more potent than enclomifene in inducing ovulation. [5]