3-(N-Maleimido-propionyl)biocytin 3-(N-Maleimidopropionyl)biocytin 3-MPB 98930-71-3 L-Lysine, N2-(3-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)-1-oxopropyl)-N6-(5-(hexahydro-2-exo-1H-thieno(3,4-d)imidazol-4-yl)-1-oxopentyl)-