1H-Imidazole-4-propanoic acid, 1-acetyl-5-formyl-4,5-dihydro-alpha,beta-dihydroxy-2-methyl-, (4R-(4alpha(alphas*,betas*),5alpha))- 2,3-(1-Acetyl-2-methyl-2-imidazolino-5,4)-2,3-dideoxymannuronic acid 2,3-Aid-mannuronic acid 82975-15-3