D-Homo-24-nor-17-oxa-6,7-secochola-7,20,22-triene-6-carboxylic acid, 3,12-bis(acetyloxy)-1,14:21,23-diepoxy-6,15-dihydroxy-4,4-dimethyl-16-oxo-, methyl ester, (1alpha,3beta,5beta,6R,12alpha,13alpha,14beta,15beta,17aalpha)-