Showing structure for methyl (2s,4ar,4br,10as,10br,12as)-6-hydroxy-2,4b,7,7,10a,12a-hexamethyl-12-methylidene-1,4,5,8-tetraoxo-2h,10bh,11h-phenanthro[1,2-c]pyran-4a-carboxylate