Using CCOC(=O)c1cnc(SC)nc1Cl, C=C(OCC)[Sn](CCCC)(CCCC)CCCC to produce C=C(OCC)c1nc(SC)ncc1C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.