(3R-(3alpha,4alpha,7(3'R*,4'R*,4'aS*)))-Dimethyl 2,2',3,3',4,4',9,9'-octahydro-1,1',4,4',8,8'-hexahydroxy-3,3'-dimethyl-9,9'-dioxo-(7,7'-Bi-4aH-xanthene)-4a,4'a-dicarboxylate (7,7'-Bi-4aH-xanthene)-4a,4'a-dicarboxylic acid, 2,2',3,3',4,4',9,9'-octahydro-1,1',4,4',8,8'-hexahydroxy-3,3'-dimethyl-9,9'-dioxo-, dimethyl ester, (3R-(3alpha,4alpha,7(3'R*,4'R*,4'aS*)))- 51152-25-1