The calculations corresponding to the OES are highlighted in Figs. and. The percentage of orbitals in the OES at CC-PCVTZ basis set for aminohexane, hexanol, and fluorohexane are 48.0, 45.9, and 45.0%, respectively. Since the EOM-CCSD* scales as O(N 6 ), this corresponds to a theoretical operation-cost reduction of two orders of magnitude (see also Table 4 below). The absolute values of the core-binding energies for these molecules for each embedding space are provided in Table .