Using C[C@@H]1Cc2cc(C(O)CN3CCN(C(=O)OCc4ccccc4)C[C@H]3CO)ccc2C(=O)O1, C=CCN to produce C=CCN1C[C@@H]2CN(C(=O)OCc3ccccc3)CCN2CC1c1ccc2c(c1)C[C@@H](C)OC2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.