24-Epicastasterone 80736-41-0 BP 214 Castasterone Ergostan-6-one, 2,3,22,23-tetrahydroxy-, (2alpha,3alpha,5alpha,22R,23R,24S)- (9CI) ergostan-6-one, 2,3,22,23-tetrahydroxy-, (2alpha,3alpha,5alpha,22R,23R,24S)-