Using O=[N+]([O-])c1cc2c(c(-c3cccs3)c1[N+](=O)[O-])NSN2c1cccs1 to produce Nc1cc2c(c(-c3cccs3)c1N)NSN2c1cccs1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.