Using O=C1NC(=O)c2ccccc21, CCOCC(O)CNC(=O)OC(C)(C)C to produce CCOCC(CNC(=O)OC(C)(C)C)N1C(=O)c2ccccc2C1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.