label: L-arginyl-[protein] + methylglyoxal + L-cysteinyl-[protein] = N(5)-[4-(S-L-cysteinyl-[protein])-5-methyl-1H-imidazol-2-yl]-L-ornithinyl-[protein] + 2 H2O + H(+)
label_lc: l-arginyl-[protein] + methylglyoxal + l-cysteinyl-[protein] = n(5)-[4-(s-l-cysteinyl-[protein])-5-methyl-1h-imidazol-2-yl]-l-ornithinyl-[protein] + 2 h2o + h(+)