Using c1cc2c(s1)C1(CCNCC1)OCC2, CC(C)(C)OC(=O)OC(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)N1CCC2(CC1)OCCc1ccsc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.