When EHF embedding is employed in MgG 4 , the 1 πRy 6 state is finally expelled from the first seven excited states and is replaced by new character, 1 ππ * 7 , which is found as the S 6 state, while the S 7 state is 1 nπ * 4 . These differences in the site states with ESP and EHF embedding in MgG 4 are due to the fact that in this system, the chromophores are much more strongly coupled and therefore, ESP and EHF charges differ much more than in G 4 . The changes in embedding charges during the EHF cycles are shown in Figure . Here, the difference between ESP and EHF charges (EHF cycles = 1 and 9, respectively) is particularly large for the oxygen atom, for which the ESP charge is -0.63e, but the EHF charge is -1.08e. Overall, the RMSD between the ESP and EHF charges is 0.175e.