Using CC(C)[Mg]Br, COc1cc2nccc(Oc3ccc(C)cc3C=O)c2cc1OC to produce COc1cc2nccc(Oc3ccc(C)cc3C(O)C(C)C)c2cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.