(2R,3S)-5,5′,6,6′,8,8′-Hexahydroxy-2,2′,3,3′-tetramethyl-2,3-dihydro-4H,4′H-9,9′-bibenzo[g]chromene-4,4′-dione

(2R,3S)-5,5′,6,6′,8,8′-Hexahydroxy-2,2′,3,3′-tetramethyl-2,3-dihydro-4H,4′H-9,9′-bibenzo[g]chromen-4,4′-dion

(2R,3S)-5,5′,6,6′,8,8′-Hexahydroxy-2,2′,3,3′-tetramethyl-2,3-dihydro-4H,4′H-9,9′-bibenzo[g]chromene-4,4′-dione

(2R,3S)-5,5′,6,6′,8,8′-Hexahydroxy-2,2′,3,3′-tétraméthyl-2,3-dihydro-4H,4′H-9,9′-bibenzo[g]chromène-4,4′-dione

[9,9′-Bi-4H-naphtho[2,3-b]pyran]-4,4′-dione, 2,3-dihydro-5,5′,6,6′,8,8′-hexahydroxy-2,2′,3,3′-tetramethyl-, (2R,3S)-

(2R,3S)-5,6,8,5′,6′,8′-Hexahydroxy-2,3,2′,3′-tetramethyl-2,3-dihydro-[9,9′]bi[benzo[g]chromenyl]-4,4′-dione