2,5-Dioxopyrrolidin-1-yl 4-(5-3aS,4S,6aR)-2-oxohexahydro-1H-thienoimidazol-4-yl)pentanamido)butanoate

2,5-Dioxopyrrolidin-1-yl 4-(5-3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamido)butanoate represents a special biotinylation reagent with a terminal NHS ester that reacts specifically and efficiently with amine-bearing compounds.