1685-91-2 NSC264720 Xanthomegnin Xanthomegnine [8,8'-Bi-1H-naphtho[1,2-c]pyran]-1,1',7,7',10,10'-hexone, 3,3',4,4'-tetrahydro-6,6'-dihydroxy-9,9'-dimethoxy-3,3'-dimethyl-, (3R,3'R)- [8,8'-Bi-1H-naphtho[1,2-c]pyran]-1,1',7,7',10,10'-hexone, 3,3',4,4'-tetrahydro-6,6'-dihydroxy-9,9'-dimethoxy-3,3'-dimethyl-, [R-(R*,R*)]- [8,8'-Bi-1H-naphtho[2,3-c]pyran]-1,1',6,6',9,9'-hexone, 3,3',4,4'-tetrahydro-10,10'-dihydroxy-7,7'-dimethoxy-3,3'-dimethyl-, [R-(R*,R*)]-