L-681,110B1

Antibiotic L-681110B1

21-O-De(3-carboxy-1-oxo-2-propenyl)-2-demethyl-2-methoxy-21-O,24-dimethylhygrolidin

21-O-Methyl-21-O-de(3-carboxy-1-oxo-2-propenyl)-2-demethyl-2-methoxy-24-methylhygrolidin