Using O=c1c2cc3ccccc3cc2oc2cc(O)cc(O)c12, ClCC1CS1 to produce O=c1c2cc3ccccc3cc2oc2cc(OCC3CS3)cc(O)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.