Using O=C1NCCN1CCNc1nccc(-c2cc3cc([N+](=O)[O-])ccc3s2)n1 to produce Nc1ccc2sc(-c3ccnc(NCCN4CCNC4=O)n3)cc2c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.