Initial Step 9 Reaction between a reducing sugar and a primary amino acid. 9 Loss of water from this molecule produces an imine that is able to cyclise, resulting in the formation of an N glycoside (a sugar attached to an NR2 group).Initial Step 9 Reaction between a reducing sugar and a primary amino acid. 9 Loss of water from this molecule produces an imine that is able to cyclise, resulting in the formation of an N glycoside (a sugar attached to an NR2 group)