. . . . "putrescine + acetyl-CoA → N-acetylputrescine + coenzyme A + 2 H+"^^ . "putrescine + acetyl-CoA → N-acetylputrescine + coenzyme A + 2 H⁺"^^ . "2.3.1.57"^^ . . . . . . . . . . . "putrescine + acetyl-CoA → N-acetylputrescine + coenzyme A + 2 H+"^^ .