α,ω-Bis-NHS-PEG

O O'BIS(2-(N-SUCCINIMIDYL-SUCCINYLAMINO&

O,O'BIS(2-(N-SUCCINIMIDYL-SUCCINYLAMINO)ETHYL)-PEG 3'000

Di(N-succinimidyl) PEG-diacid 3,000, PEG-bis(N-succinimidyl succinate) 3,000