Using CCc1c(OC)nc2nc(C(O)c3ccc(OC)cc3)cn2c1C to produce CCc1c(OC)nc2nc(C(=O)c3ccc(OC)cc3)cn2c1C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.