Showing structure for methyl (2r,4as,4br,5r,6as,10ar,10br,12as)-5-hydroxy-2,4b,7,7,10a,12a-hexamethyl-12-methylidene-1,4,6,8-tetraoxo-hexahydro-4ah-phenanthro[1,2-c]pyran-2-carboxylate