Using CCCC[Sn](C=Cc1ccc2cc(C#N)ccc2c1)(CCCC)CCCC, CN(C)C=O to produce CC(C)C1=NCCc2ccc(C=Cc3ccc4cc(C#N)ccc4c3)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.