131274-04-9 5-(N-Maleimido)-3-oxapentyl-(2-((3-carboxybenzoyl)thio)acetyl)glycyl-glycyl-glycinate 5-Moctggg Glycine, N-(N-(N-(((3-carboxybenzoyl)thio)acetyl)glycyl)glycyl)-, 1-(2-(2-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)ethoxy)ethyl) ester