Using COc1ccc(-c2sc3cc(OC)ccc3c2C(=O)c2ccc(C=CC(=O)O)cc2)cc1 to produce O=C(O)/C=C/c1ccc(C(=O)c2c(-c3ccc(O)cc3)sc3cc(O)ccc23)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.