label: 19-NORPREGNA-5(10),9(11)-DIENE-3,20-DIONE, 17-((TRIMETHYLSILYL)OXY)-, CYCLIC 3-(1,2-ETHANEDIYL ACETAL)
label_lc: 19-norpregna-5(10),9(11)-diene-3,20-dione, 17-((trimethylsilyl)oxy)-, cyclic 3-(1,2-ethanediyl acetal)