As a final point of comparison between small-molecule results (exemplified by the S66 data set) and those for larger complexes, we consider DLPNO-CCSD(T) calculations for the L7 data set. For systems of this size, the memory requirement for canonical CCSD(T) exceed the 3 Tb available on our hardware, 104 so we will use DLPNO-CCSD(T) calculations with tight-CCSD(T) thresholds (T CutPNO = 10 -7 ) as reference values. We will present DLPNO-CCSD(T 0 ) results in detail but we find that nearly identical interaction energies are obtained using the iterative T 1 approximation for the triples, with a maximum difference of 0.17 kcal/mol for the ggg complex. (See Table for a side-by-side comparison of T 0 and T 1 results.) Other studies have found similarly small differences between T 0 and T 1 for intermolecular interactions. It is reported (though not quantified) that the T 0 approximation fails for cumulenes, , which might be attributed to extended conjugation except that we observe no such failure for c2c2pd.