Antibiotics TAN-1057.

摘要

Novel antibiotics TAN-1057 represented by the formula: <CHEM> wherein, the absolute configuration in (A) is R or S, each R1 and R3 is a bonding hand or hydrogen, and R2 is a bonding hand, provided that when R2 binds with R1 or R3 the other is hydrogen, were produced by microorganisms belonging to the genus Flexibacter. TAN-1057 strongly inhibit the growth of pathogenic microorganisms and malignant tumors, thus being useful as therapeutic agents of infectious diseases or antitumor agents.