Pentagestrone
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Pentagestrone (INNTooltip International Nonproprietary Name), also known as 17α-hydroxyprogesterone 3-cyclopentyl enol ether, is a steroidal progestin of the 17α-hydroxyprogesterone group that was never marketed. An acetate ester, pentagestrone acetate (Gestovis, Gestovister), has been marketed for clinical use. Pentagestrone was described in the literature in 1960.