Using OB(O)c1ccc(Cl)cc1, CCOC(=O)c1cc(C2CC2)c2c(C)c(Cl)ccn2c1=O to produce CCOC(=O)c1cc(C2CC2)c2c(C)c(-c3ccc(Cl)cc3)ccn2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.