levator

S-23 ((S)-3-(4-chloro-3-fluorophenoxy)-N-(4-cyano-3-(trifluoromethyl)phenyl)-2-hydroxy-2-methylpropanamide) is an oral selective androgen receptor modulator (SARM) with a Ki of 1.7 nM. S-23 increases prostate, seminal vesicle, and levator ani muscle weights in castrated rats.

JNJ-37654032 is a nonsteroidal AR ligand with mixed agonist and antagonist activity. It is an orally active SARM with muscle selectivity. It stimulated growth of the levator ani muscle with ED(50) 0.8 mg/kg, stimulating maximal growth at a dose of 3mg/kg.