The energetic, structural, and spectroscopic properties of these 19 molecules are analyzed in detail here. . The CCSD(T) method, which treats single and double excitations exactly and triple excitations perturbatively , is computationally demanding but highly accurate. Unless otherwise specified, the reported energies for smaller molecules are zero kelvin energy differences referenced to the most stable conformer. These values were computed using the CCSD(T)/aug-cc-pVQZ//ωB97XD/def2-TZVP method, with zero-point energy corrections derived from ωB97XD/def2-TZVP geometries.