Using C=CC[Sn](CCCC)(CCCC)CCCC, [O-][n+]1nc(I)nc2cc3c(cc21)CCC3 to produce C=CCc1nc2cc3c(cc2[n+]([O-])n1)CCC3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.