Using COC(=O)c1ccc(OC2CCC3(CC2)SC[C@@H](C(=O)O)N3C(=O)c2ccccc2)cc1 to produce O=C(O)c1ccc(OC2CCC3(CC2)SC[C@@H](C(=O)O)N3C(=O)c2ccccc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.