Using CCOC(=O)C1(N)Cc2ccccc2C1, O=C(O)c1cccc2c1NCCC2 to produce CCOC(=O)C1(NC(=O)c2cccc3c2NCCC3)Cc2ccccc2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.