Using O=c1c(Br)cn(Cc2ccccc2)cc1Cc1ccccc1, C=C(OCC)[Sn](CCCC)(CCCC)CCCC to produce CC(=O)c1cn(Cc2ccccc2)cc(Cc2ccccc2)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.