17alpha-Methyltestosterone 3-cyclopentyl enol ether 3-(Cyclopentyloxy)-17-methyl-androsta-3,5-dien-17beta-ol 67-81-2 EINECS 200-670-6 PENMESTEROL Penmesterol [DCF:INN] Penmesterolo [DCIT] Penmesterolum [INN-Latin] RP 12222