yct529 yct529 yct529 is a drug which acts as a potent and selective antagonist of the vitamin a receptor retinoic acid receptor alpha (rar-α). in studies on mice it produced a 99% reduction in sperm production, and it has proceeded to early stage human clinical trials as a potential male contraceptive. yct529identifiers iupac name 4--1h-pyrrol-2-yl]benzoic acid pubchem cid162679554chemical and physical dataformulac29h25no3molar mass435.523 g·mol−13d model (jsmol)interactive image smiles cc1=cc=c(c=c1)c2=cc(oc3=c2c=c(c=c3)c4=cc=c(n4)c5=cc=c(c=c5)c(=o)o)(c)c inchi inchi=1s/c29h25no3/c1-18-4-6-19(7-5-18)24-17-29(2,3)33-27-15-12-22(16-23(24)27)26-14-13-25(30-26)20-8-10-21(11-9-20)28(31)32/h4-17,30h,1-3h3,(h,31,32)key:qlxscdxzoyrdax-uhfffaoysa-n