Using CNCC(=O)OC(C)(C)C, CC(=O)OCC(=O)COC(C)=O to produce CC(=O)OCC(COC(C)=O)N(C)CC(=O)OC(C)(C)C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.