Using COCCN1C(=O)CNc2ncc([Sn](C)(C)C)nc21, Cc1nc(-c2ncn(C3CCCCO3)n2)ccc1Br to produce COCCN1C(=O)CNc2ncc(-c3ccc(-c4nnc[nH]4)nc3C)nc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.