label: 2 N(delta)-hydroxy-N(omega)-methyl-L-citrulline + 2 nitric oxide + A => 2 N(delta)-hydroxy-N(omega)-methyl-N(omega)-nitroso-L-citrulline + AH2
label_lc: 2 n(delta)-hydroxy-n(omega)-methyl-l-citrulline + 2 nitric oxide + a => 2 n(delta)-hydroxy-n(omega)-methyl-n(omega)-nitroso-l-citrulline + ah2