2-Oxabicyclo[2.2.2]octan-3-one,7-[(3b,4b,5b,6b,17a)-5,6-epoxy-3,4,17-trihydroxy-1-oxoandrostan-17-yl]-5-hydroxy-4,5-dimethyl-,[1S-(1a,4a,5b,7S*)]-