2H-Dibenzo(c,mn)naphtho(2,3-g)xanthene-6,13,18(3H)-trione, 3a,3b,4,5-tetrahydro-1,3,4,7,8,17-hexahydroxy-10,15-dimethyl- (VAN) 35883-84-2 39546-16-2 Flavoskyrin