18412-96-9 AIDS-046013 AIDS046013 GB 2a GB-2a [3,8'-Bi-2H-1-benzopyran]-4,4'(3H,3'H)-dione, 2'-(3,4-dihydroxyphenyl)-5,5',7,7'-tetrahydroxy-2-(4-hydroxyphenyl)-, (2S,2'S,3R)-