118214-76-9
3-(1,3-dioxolan-2-yl)-4-methylpentyl methanesulphonate
→
118229-87-1
(20R)-3β-(dimethyl-t-butylsilyloxy)-15β-hydroxy-24-oxocholesta-5,16-diene 24-ethylene acetal
481-21-0
5alpha-胆甾烷