Using Cc1csc(NC(=O)Cn2c3c(c4cccc(Br)c42)CCN(C(=O)OC(C)(C)C)CC3)n1 to produce Cc1csc(NC(=O)Cn2c3c(c4cccc(Br)c42)CCNCC3)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.