[3aS,(-)]-2-[[4-O-Aminocarbonyl-2-[methyl[(methylamino)acetyl]amino]-2-deoxy-β-D-gulopyranosyl]amino]-1,3aβ,5,6,7,7aα-hexahydro-7β-hydroxy-4H-imidazo[4,5-c]pyridine-4-one