Scheme 1. MG modification of arginine.
MG adducts to arginine, and upon condensation, forms a neutral hydroimidazolone ring. MG-H1 is the methylglyoxal-derived hydroimidazolone isomer 1 (Nδ-(5-hydro-5-methyl-4-imidazolon-2-yl)-ornithine)
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