Desogestrel54024-22-5100 % similar Etonogestrel54048-10-172 % similar Lynestrenol52-76-655 % similar Norgestrel6533-00-249 % similar Levonorgestrel797-63-749 % similar Ethylestrenol965-90-243 % similar Allylestrenol432-60-037 % similar Norethindrone68-22-436 % similar Norgestimate35189-28-733 % similar Gestodene60282-87-333 % similar Gestrinone16320-04-032 % similar Ethisterone434-03-731 % similar