label: L-arginyl-[protein] + formaldehyde + succinate + CO2 => N(omega)-methyl-L-arginyl-[protein] + 2-oxoglutarate + O2
label_lc: l-arginyl-[protein] + formaldehyde + succinate + co2 => n(omega)-methyl-l-arginyl-[protein] + 2-oxoglutarate + o2