2,5-Dioxopyrrolidin-1-yl 4,7,10,13-tetraoxahexadec-15-yn-1-oate(Propargyl-PEG4-NHS ester), 98%

*This document is like a lab demo—an example Certificate of Analysis (COA) that showcases what a COA looks like but may not match the latest batch in all its glory. Think of it as a chemistry experiment: close, but not quite the final reaction!