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Xanthones investigated in the scope of this work: 1,2-dihydroxy-9H-xanthen-9-one (1), 3,4-dihydroxy-1-methyl-9H-xanthen-9-one (2), 3,4,6-trihydroxy-1-methyl-9H-xanthen-9-one (3), 1,4-dihydroxy-3-methoxy-9H-xanthen-9-one (4), and 1,8-dihydroxy-3,6-dimethyl-9H-xanthen-9-one (5).
