1) DSS (disuccinimidyl suberate)
O=C(ON1C(CCC1=O)=O)CCCCCCC(ON2C(CCC2=O)=O)=O
2) TSTU (,N,N′,N′-Tetramethyl-O-(N-succinimidyl)uronium tetrafluoroborate)
O=C(CCC1=O)N1/[O+]=C(N(C)C)/N(C)C.F[B-](F)(F)F
3) Suberic anhydride
O=C(O1)CCCCCCC1=O
4) disuccinimidyl carbonate
O=C(ON1C(CCC1=O)=O)ON2C(CCC2=O)=O
заранее спасибо!