Using CC(C)(C)OC(=O)NC1CCC(C=O)CC1, COc1cccc2scnc12 to produce COc1cccc2sc(C(O)[C@H]3CC[C@H](NC(=O)OC(C)(C)C)CC3)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.