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allelochemicals from stauranthus perforatus, a rutaceous tree of the yucatan peninsula, mexico.aqueous leachates and a chcl3-meoh (1:1) extract of roots of stauranthus perforatus showed a significant phytotoxic effect on amaranthus hypochondriacus and echinochloa crus-galli. bioassay-directed fractionation of the active organic extract led to the isolation and characterization of ten secondary metabolites, which included two pyranocoumarins [xanthyletin (1) and 3-(1',1'-dimethylallyl)-xanthyletin (2)], four furanocoumarins [chalepensin (3), ammirin (4), chalepin (5) and 2'-isopropyl-psora ...200515694456
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