3-(Cyclopentyloxy)pregna-3,5-dien-20-one 3-Cyclopentyloxy-3,5-pregnadien-20-on 67-95-8 Pregna-3,5-dien-20-one, 3-(cyclopentyloxy)- QUINGESTRONE Quingestrona [INN-Spanish] Quingestrone [USAN:INN] Quingestronum [INN-Latin] W 3399