Using CCCC[Sn](C=COCC)(CCCC)CCCC, COC(=O)c1nc(Cl)cc(NC(C)=O)c1Cl to produce C=C(OCC)c1cc(NC(C)=O)c(Cl)c(C(=O)OC)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.