ru-58642 ru-58642 ru-58642 is a nonsteroidal antiandrogen (nsaa) derived from nilutamide with very high affinity and selectivity for the androgen receptor (ar), which made it among the most potent and efficacious antiandrogens known at the time of its discovery. it was investigated for topical application for the treatment of androgenetic alopecia (male-pattern baldness), but development did not proceed past initial trial stages, and it is now only used for scientific research into the ar. ru-58642clinical datadrug classnonsteroidal antiandrogenidentifiers iupac name 4--2-(trifluoromethyl)benzonitrile cas number143782-63-2 ypubchem cid9840708chemspider8016425uniidx44gs85hkcomptox dashboard (epa)dtxsid50162546 chemical and physical dataformulac15h11f3n4o2molar mass336.274 g·mol−13d model (jsmol)interactive image smiles o=c1n(cc#n)c(c)(c)c(=o)n1c(cc2c(f)(f)f)ccc2c#n inchi inchi=1s/c15h11f3n4o2/c1-14(2)12(23)22(13(24)21(14)6-5-19)10-4-3-9(8-20)11(7-10)15(16,17)18/h3-4,7h,6h2,1-2h3key:zvwxhsnublikjh-uhfffaoysa-n