Using COc1ccc2cc([C@H](C)C(=O)OCC(OC)OC)ccc2c1, O=C(O)CS to produce COc1ccc2cc([C@H](C)C(=O)OC[C@H]3OC(=O)CS3)ccc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.