Ald-Ph-amido-PEG4-C2-NHS ester 

1353011-74-1

Propanoic acid, 3-[[13-(4-formylphenyl)-13-oxo-3,6,9-trioxa-12-azatridec-1-yl]oxy]-, 2,5-dioxo-1-pyrrolidinyl ester; 2,5-Dioxo-1-pyrrolidinyl 3-[[13-(4-formylphenyl)-13-oxo-3,6,9-trioxa-12-azatridec-1-yl]oxy]propanoate; 2,5-dioxopyrrolidin-1-yl 1-(4-formylphenyl)-1-oxo-5,8,11,14-tetraoxa-2-azaheptadecan-17-oate;