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Proposed phenomenological excited state diagram and spectroscopic assignments for CYP3A4 and CYP2C9 excited a 408 nm. At 408 nm absorption is into the Soret band. The luminescence at about 500 nm is assigned to a 1ππ*→gs fluorescence from the Soret in violation of Kasha's rule. The structured luminescence is assigned to a 3ππ*→gs phosphorescence with the same orbital parentage as the Soret.
