(4aS,4bS,5aS,6aS,7R,8S,9aS,9bS)-7-hydroxy-7-(2-iodoacetyl)-4a,6a,8-trimethyl-5a,6,6a,7,8,9,9a,9b,10,11-decahydrocyclopenta[1,2]phenanthro[4,4a-b]oxiren-2(4aH)-one