Using O=C(O)c1cn2c3c(c(-c4ccccc4)ccc3c1=O)CCC2 to produce O=C([O-])c1cn2c3c(c(-c4ccccc4)ccc3c1=O)CCC2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.