Using COc1cc(C)c(C(O)c2c(OC)ncc(Cl)c2C)c(OC)c1OC to produce COc1cc(C)c(C(=O)c2c(OC)ncc(Cl)c2C)c(OC)c1OC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.