Showing structure for (1r,3as,5ar,5br,7ar,9s,11as,11bs,13ar,13br)-1-(1-carboxyeth-1-en-1-yl)-9-hydroxy-5a,5b,8,8,11a-pentamethyl-hexadecahydrocyclopenta[a]chrysene-3a-carboxylic acid