Verrulactones A and B, new inhibitors of Staphylococcus aureus enoyl-ACP reductase produced by Penicillium verruculosum F375.

New dimeric compounds of alternariol class, verrulactones A and B, were isolated from a culture broth of the fungal strain Penicillium verruculosum F375 and their structure were established by various spectral analysis. Verrulactones A and B strongly inhibited Staphylococcus aureus enoyl-ACP reductase with IC(50) of 0.92 and 1.41 μM, respectively, and also showed antibacterial activity against S. aureus and MRSA with MICs of 8 and 16 μg/mL, respectively.