Beyond these diatomics, we test DVS-APC for modeling vertical excitations for two other previously studied transition-metal complexes: MnO - 10 singlet states, including the 1 1 A 1 ground state, are investigated. For the latter, 7 quartet and 3 doublet states are explored, including the 1 4 A 2g ground state. These give precedence for the application of our methodology to more relevant and realistic systems, but come with less complete and less reliable reference data when compared with the TBEs available for the transition metal diatomic excitations.