.delta.6,7-Estrone .delta.6-Estrone 1,3,5(10),6-Estratetrien-3.beta.-ol-17-one 2208-12-0 3-Hydroxyestra-1,3,5(10),6-tetraen-17-one 6,7-Didehydroestrone 6-Dehydroestrone Dehydro-estrone Estra-1,3,5(10),6-tetraen-17-one, 3-hydroxy- NSC48999