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Acronychia crassipetala is an endemic plant species in Australia. Its phytochemistry and therapeutic properties are underexplored. The hexane extract of the fruit A. crassipetala T. G. Hartley was found to inhibit the growth of the Gram-positive bacteria Staphylococcus aureus . Following bio-activity guided fractionation, two prenylated acetophenones, crassipetalonol A ( 1 ) and crassipetalone A ( 2 ), were isolated. Their structures were determined mainly by NMR and MS spectroscopic analyses. This is the first record of the isolation and structural characterisation of secondary metabolites from the species A. crassipetala . Their antibacterial and cytotoxic assessments indicated that the known compound ( 2 ) had more potent antibacterial activity than the antibiotic chloramphenicol, while the new compound ( 1 ) showed moderate cytotoxicity.

Potent Antibacterial Prenylated Acetophenones from the Australian Endemic Plant Acronychia crassipetala