Using O=C([O-])[O-], COC(=O)CCC1CCCN2CCc3c([nH]c4ccccc34)C12 to produce CCOC(=O)CCC1CCCN2CCc3c([nH]c4ccccc34)C12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.