Using CCc1[nH]n(C2CCCC2)c2nc(-c3ccc([N+](=O)[O-])cc3)nc(=O)c1-2, Cl[Sn]Cl to produce CCc1[nH]n(C2CCCC2)c2nc(-c3ccc(N)cc3)nc(=O)c1-2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.