Using CS(=O)(=O)c1ccc2c(c1)ncn2C1CCN(CCC(=O)c2ccccc2)CC1 to produce CS(=O)(=O)c1ccc2c(c1)ncn2C1CCN(CCC(O)c2ccccc2)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.