ed above], followed by removal of protecting group(s). [0172] Process Q [0173] Aerothricins of the Formula (I) [wherein ???Y???(CH2)m???X???R4 is n-tridecanyl or 1-methytridecanyl) R5 is ???CONH2, Z is an oxygen atom and R1, R2, and R3 are as defined above] can be prepared from the linear peptide of the Formula (IX) by the method outlined in Scheme 1. [0174] The compound of above formula (III), wh