label: ESTR-9(11)-EN-3-ONE, 5,10-EPOXY-17-HYDROXY-17-(1-PROPYN-1-YL)-, CYCLIC 1,2-ETHANEDIYL ACETAL, (5.ALPHA.,10.ALPHA.,17.BETA.)-
label_lc: estr-9(11)-en-3-one, 5,10-epoxy-17-hydroxy-17-(1-propyn-1-yl)-, cyclic 1,2-ethanediyl acetal, (5.alpha.,10.alpha.,17.beta.)-