Using COc1cc(Cl)c(C(=O)C23CC4CC(CC(C4)C2)C3)c(OC)c1 to produce O=C(c1c(O)cc(O)cc1Cl)C12CC3CC(CC(C3)C1)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.