Using COC(=O)/C=C/C(=O)O, COCCN(CCOC)C(=O)[C@H](C)O to produce COCCN(CCOC)C(=O)[C@H](C)OC(=O)/C=C/C(=O)OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.