Using O=C1CCC(=O)O1, CC(C)(C)OC(=O)N1CCN(CCO)CC1 to produce CC(C)(C)OC(=O)N1CCN(CCOC(=O)CCC(=O)O)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.