Using C=C(C)c1csc2c1OC(C)CN(C(=O)OC(C)(C)C)C2 to produce CC1CN(C(=O)OC(C)(C)C)Cc2scc(C(C)C)c2O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.