Using O=C(COc1ccc([N+](=O)[O-])cc1)OCCO, O=C(O)COc1ccc([N+](=O)[O-])cc1 to produce O=C(COc1ccc([N+](=O)[O-])cc1)OCCOC(=O)COc1ccc([N+](=O)[O-])cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.