In our preliminary cytotoxic evaluation of compounds 1–4 against human cervical cancer cells (HeLa) and rat kidney cells infected with a temperature-sensitive mutant of Rous sarcoma virus (srcts-NRK), all compounds exhibited moderate cytotoxicities toward both cell lines (Table 3), implying a broad spectrum of the cytotoxicity of iturins. This evidence concerns the gene NRK and cervical carcinoma.