Using COc1ccc(-c2c(N)oc3c(C(C)(C)C)cc(C(C)(C)C)cc23)cc1OC, CO to produce COc1ccc(C2C(=O)Oc3c2cc(C(C)(C)C)cc3C(C)(C)C)cc1OC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.