Neohydroxyaspergillic acid is a fungal metabolite produced by A. sclerotiorum that has antibiotic and antifungal activities. It inhibits the growth of P. aeruginosa, M. smegmatis, S. aureus, E. coli, K. pneumoniae, B. mycoides, and B. subtilis bacteria (MICs = 125-500 μg/ml). Neohydroxyaspergillic acid also inhibits the growth of G. convolute, S. consortiale, P. blakesleeanus, C. globosum, and T. mentagrophytes (MICs = 175-700 μg/ml) but not A. niger, P. notatum, M. verrucaria, or S. cerevisiae fungi.