Using COc1ccc(C2C(=O)OC3=CC(O)(OC(C)=O)C=CC3=C2C)c(OC)c1 to produce Cc1c(-c2ccc(O)cc2O)c(=O)oc2cc(O)ccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.