Mal-PEG-Succinimidyl Valerate(MAL-PEG-SVA ,SVA-PEG-MAL) is a PEG derivative containing a succinimidyl valerate group and a terminal maleic acid. Has a terminal active ester that reacts with NH2 to form a stable amide bond. Applied in medical research, drug release, nanotechnology and new material research, cell culture.