Using NCC1CC1, Cn1c(Nc2c(Cl)cncc2Cl)nc2cc(C(=O)O)c3c(c21)CC(C)(C)O3 to produce Cn1c(Nc2c(Cl)cncc2Cl)nc2cc(C(=O)NCC3CC3)c3c(c21)CC(C)(C)O3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.