Using OC1CCC1, CS(=O)c1sc(-c2cc[nH]n2)c2c1C(=O)CC(C)(C)C2 to produce CC1(C)CC(=O)c2c(OC3CCC3)sc(-c3cc[nH]n3)c2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.