Using COCc1c(CO)ncc2[nH]c3cccc(Cc4ccc(Cl)cc4)c3c12 to produce COCc1c(C=O)ncc2[nH]c3cccc(Cc4ccc(Cl)cc4)c3c12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.