Plant Antimutagens, 6. Intricatin and Intricatinol, New Antimutagenic Homoisoflavonoids from Hoffmanosseggia intricata

Abstract
Intricatin [1] and intricatinol [2] are new homoisoflavonoids isolated from a desert plant Hoffmanseggia intricata, which was collected in Baja California, Mexico. The structures of the compounds were elucidated using a variety of spectroscopic techniques. The structure of 1 was shown to be 7,4''-dimethoxy-8-hydroxyhomoisoflavone, and 2 was shown to be 4''-methoxy-7,8-dihydroxyhomoisoflavone. Both compounds 1 and 2 displayed activity in the inhibition of the mutagenicity of 2AN toward Salmonella typhimurium (T98). Compound 2 was much more active than 1 in the case of the inhibition of the mutagenicity of AAF toward S. typhimurium (T98) and the inhibition of EMS towards S. typhimurium (T100). Compounds 1 and 2 are the first examples of antimutagenic activity in homoisoflavones.

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