11-(1,3-Benzodioxol-5-yl)-5,17-dihydroxy-17-(1-propynyl)-estr-9-en-3-one Cyclic 1,2-Ethanediyl Acetal is an intermediate used in the synthesis of (11β,17β)-11-(1,3-Benzodioxol-5-yl)-17-hydroxy-17-(1-propyn-1-yl)estra-4,9-dien-3-one (B198850), which is a glucocorticoid receptor (GR) antagonists.