In the PPP model, CCSD(T) does not overestimate dispersion interactions for acene and polyaromatic hydrocarbon dimers up to dibenzocoronene, and higher-level benchmarks show CCSDT, not CCSD(T), is the unreliable method.
Grimme , Semiempirical GGA-type density functional constructed with a long-range dispersion correction
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On the applicability of CCSD(T) for dispersion interactions in large conjugated systems
In the PPP model, CCSD(T) does not overestimate dispersion interactions for acene and polyaromatic hydrocarbon dimers up to dibenzocoronene, and higher-level benchmarks show CCSDT, not CCSD(T), is the unreliable method.