N-Maleoyl-GABAγ-MALEIMIDOBUTYRIC ACID4-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)butanoic acidγ-Maleimidobutyric acid4-Maleimidobutanoic acidN-(3-Carboxypropyl)maleimideN-Maleoyl-4-aminobutyric acid4-Maleimidobutyric acid2,5-Dihydro-2,5-dioxo-1H-pyrrole-1-butanoic Acid4-Maleimidobutyric Acid