Using C=C[Sn](CCCC)(CCCC)CCCC, CC(C)(C)OC(=O)NC1(c2ccc(-c3c(-c4ccccc4)oc4c(Br)cccc4c3=O)cc2)CCC1 to produce C=Cc1cccc2c(=O)c(-c3ccc(C4(NC(=O)OC(C)(C)C)CCC4)cc3)c(-c3ccccc3)oc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.