in the condensation reaction , n-acetylglucosamine , n-acetylgalactosamine , glucosamine , and galactosamine could not replace n-acetylmannosamine as substrate , and phosphoenolpyruvate , lactate , beta-hydroxypyruvate , and other pyruvate derivatives could not replace pyruvate as substrate .
C0001056
n-acetylglucosamine
C0017718
glucosamine