Coupled cluster methods 1 allow for the quantum-chemical treatment of molecular systems with high accuracy. In particular, the CCSD(T) model 2 in combination with sufficiently large basis sets is often considered the "gold standard" of computational chemistry, as it mostly provides outstanding accuracy at relatively moderate computational cost. Nonetheless, its steep computational scaling (with the seventh power of the number of basis functions) considerably restricts its applicability for large and complex chemical systems.