Using COc1cccc(CC(O)c2nccn2Cc2cc(Cl)cc(Cl)c2)c1 to produce COc1cccc(CC(=O)c2nccn2Cc2cc(Cl)cc(Cl)c2)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.