Using CC(=O)OC1CC(N2C(=O)c3ccccc3C2=O)C(=O)NC1=O to produce O=C1NC(=O)C(N2C(=O)c3ccccc3C2=O)CC1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.