How does aminoguanidine interfere with the formation of advanced glycation endproducts?
I would expect the N-amino group of aminoguanidine to react with 3-deoxyglucosone at either of the adjacent, reactive carbonyl groups to form a stable guanidinylimine derivative (analogous to a hydrazone). This derivative, unlike 3-deoxyglucosone itself, would not be able to react with free amino groups on proteins and continue on the pathway to AGEs, but rather would be excreted as is.