3,3’-tetramethyl-’-hexahydroxy-2’

Chaetochromin A, Chaetochromin B, Chaetochromin D, Chaetochromin, stereoisomer

(9,9’-bi-4h-naphtho(2,3-b)pyran)-4,4’-dione,2,2’,3,3’-tetrahydro-5,5’,6,6’,8,8

2,2',3,3'-Tetrahydro-5,5',6,6',8,8'-hexahydroxy-2,2',3,3'-tetramethyl-[9,9'-bi-4H-naphtho[2,3-b]pyran]-4,4'-dione