L. Pistelli et al., CHEMICAL-CONSTITUENTS OF ARISTOLOCHIA-RIGIDA AND MUTAGENIC ACTIVITY OF ARISTOLOCHIC ACID-IV, Journal of natural products, 56(9), 1993, pp. 1605-1608
Two aristolochic acids (2 and 3] and a flavonol glycoside 1 have been
isolated from Aristolochia rigida (Aristolochiaceae). Aristolochic aci
d IV [2], the most abundant constituent, has shown a weak direct mutag
enic activity in the Ames test: this action seems to be inhibited, at
least in part, by metabolic reactions.