A series of hypericin analogs were found to differ in their cytotoxic activity induced by ambient light levels. These analogs vary in their ability to partition into cells, to generate singlet oxygen as well as in other photophysical properties. The data suggest that the biological activity of hypericin is due to a combination of factors whose roles may vary under different circumstances.

Nigerpyrone A, aloenin aglycone, 4’-methyl klavuzon, and allantopyrone C were synthesized from commercially available aldehydes.

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