Using COc1cnc2c(c1)cc(/C=C/C(=O)O)n2Cc1ccc(Cl)cc1 to produce COc1cnc2c(c1)cc(CCC(=O)O)n2Cc1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.