SUNBRIGHT® GL2-400GS2

2arm branched PEG, -(CH2)3NHCO(CH2)3COO-NHS, Mw 40,000
Chemical Name: 2,3-Bis(methylpolyoxyethylene-oxy)-1-{3-[(1,5-dioxo-5-succinimidyloxy, pentyl)amino]propyloxy} propane