4,8a(1H)-Picenedicarboxylic acid, 13-(chloromethyl)-2,3,4,4a,5,6,6a,7,8,9,10,11,12,12a,13,14,14a,14b-octadecahydro-2,3-dihydroxy-4,6a,11,11,14b-pentamethyl-, (2S,3R,4S,4aR,6aR,8aS,12aS,13S,14aR,14bR)-