Using COc1ccc(C=C2C=CC3=C(C2)C(=O)NC(=O)C3)cc1 to produce O=C1CC2=C(CC(=Cc3ccc(O)cc3)C=C2)C(=O)N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.