Using CCc1c(C)nc(-c2ccccc2O)n(CCc2ccccc2)c1=O, O=C([O-])[O-] to produce CCc1c(C)nc(-c2ccccc2OC)n(CCc2ccccc2)c1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.