Using CC(C)(C)OC(=O)NC1(C(=O)O)CCc2ccccc2C1, CCOC(C)=O to produce CN(C(=O)OC(C)(C)C)C1(C(=O)O)CCc2ccccc2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.