Using CCOC(=O)C1(C)/C(=C/c2ccccc2)OC2CC(=O)N21 to produce CC1(C(=O)[O-])/C(=C/c2ccccc2)OC2CC(=O)N21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.