Using O=C1OC(COc2ccc([N+](=O)[O-])cc2)CN1c1ccccn1 to produce Nc1ccc(OCC2CN(c3ccccn3)C(=O)O2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.