Antibacterial substance.

摘要

An antibacterial substance comprising a peptide comprising a fragment constituting lepidopteran A and containing the N-terminal amino acid residue of the lepidopteran A, wherein the carboxyl group at the C-terminal of said peptide is substituted with an alkyl amide group represented by Formula (I): -CONH(CH2)nCH3 (I) wherein n is an integer of 2 to 16. This antibacterial substance shows good antibacterial activities against various bacteria, and is useful as pharmaceuticals and agricultural chemicals.