Synonyms: 6-KETO ETHINYL ESTRADIOL;6-KETOETHYNYLESTRADIOL;1,3,5(10)-ESTRATRIEN-17-ALPHA-ETHYNYL-3,17-BETA-DIOL-6-ONE;3,17BETA-DIHYDROXY-17A-ETHYNYLESTRA-1,3,5(10)-TRIEN-6-ONE;3,17BETA-DIHYDROXY-19-NORPREGNA-1,3,5(10)-TRIEN-20-YN-6-ONE;6-KETO-17A-ETHINYLESTRADIOL