Using CC(C)(C)OC(=O)n1c2c(c3c(Cl)c(Cl)ccc31)CCCC2=O to produce O=C1CCCc2c1[nH]c1ccc(Cl)c(Cl)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.