Using O=C(O)CCl, Oc1ccc(C(=C2SCCCS2)c2ccccc2)cc1 to produce O=C(O)COc1ccc(C(=C2SCCCS2)c2ccccc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.