Isobavachalcone (IBC) is a chalcone and flavonoid originally isolated from P. corylifolia and has diverse biological activities.^1,2 It is active against C. albicans and C. neoformans (IC50s = 3 and 7 µg/ml, respectively), as well as T. rubrum and M. audouinii (MIC = 1.2 µg/ml for both).¹ IBC is active against various Bacillus, Streptococcus, and Proteus species, as well as K. pneumoniae, P. aeruginosa, S. typhi, M. morganii, E. aerogenes, C. freundii, and E. cloacae (MICs = 4.9-39.1 µg/ml). It induces mitochondrial-mediated apoptosis in IMR-32 and NB-39 human neuroblastoma cells and inhibits the proliferation of OVCAR-8 ovarian, PC3 prostate, MCF-7 breast, and A549 lung cancer cell lines. IBC (50 mg/kg) reduces dopaminergic neuronal cell death and increases the stay time in the rotarod test in a mouse model of MPTP-induced Parkinson’s disease.²