for the following products
4-alpha-Amino-N-acetyl-2-deoxy-2,3-didehydro-D-neuraminate | 4-Amino-2-deoxy-2,3-didehydro-N-acetylneuraminic acid | 5-(Acetylamino)-4-amino-2,6-anhydro-3,4,5-trideoxy-D-glycero-D-galactonon-2-enonic acid | Zanamivir amine and Zanamivir intermediates A
