Using COC(=O)C(C)(CO)NC(=O)OC(C)(C)C, COC(C)(C)OC to produce COC(=O)C1(C)COC(C)(C)N1C(=O)OC(C)(C)C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.