Clomid, as Clomiphene Citrate, has the chemical formula of C26H28ClNO. It belongs to the triphenylethylene group and shares closely related properties with Nolvadex, another compound from the triphenylethylene group. Clomid is composed of two cis-trans isomers viz. E-clomiphene and Z-clomiphene. Clomiphene Citrate is a derivative of diphenyl ethylene stilbene and depending on its target tissues, it functions either as an estrogen agonist or an estrogen antagonist. Essentially, Clomiphene Citrate, Clomid is a Selective Estrogen Receptor Modulator (SERM). SERMs in their own right are anti-estrogens, substances which inhibit the production, use, or effects of estrogens.