139595-03-2 23-O-(3-Carboxy-1-oxo-2-propenyl)-23-O-de(4-O-(aminocarbonyl)-2,6-dideoxy-beta-D-arabino-hexopyranosyl)-25-de(1-propenyl)-25-methylconcanamycin A Concanamycin A, 23-O-(3-carboxy-1-oxo-2-propenyl)-23-O-de(4-O-(aminocarbonyl)-2,6-dideoxy-beta-D-arabino-hexopyranosyl)-25-de(1-propenyl)-25-methyl- Viranamycin A