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(7R,8R)-7-[(7S,8R,15S)-1,2,3,12,13,14,15-heptahydroxy-5,10-dioxo-5,7,8,10-tetrahydro-4,7-methanodibenzo[f,h][1,4]dioxecin-8-yl]-1,2,3,13,14,15-hexahydroxy-5,11-dioxo-5,8,9,11-tetrahydro-7H-dibenzo[g,i related products: