Using CC(=O)OC(C)=O, O=CC(CC(=O)O)NC(=O)C1CCCN2C(=O)CCC(NC(=O)c3ccccc3)C(=O)N12 to produce CC(=O)OC1OC(=O)CC1NC(=O)C1CCCN2C(=O)CCC(NC(=O)c3ccccc3)C(=O)N12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.