In the title solvated salt, (C21H20N3){B(C6H5)4}·2CH3CN (systematic name 3,8-diamino-5-ethyl-6-phenylphenanthridin-5-ium tetraphenylborate acetonitrile disolvate), the dihedral angle between the tricyclic fused ring system (r.m.s. deviation = 0.021 Å) and the pendant phenyl group of the ethidium cation is 84.91 (7)°. The {B(C6H5)4}− anion has a typical tetrahedral structure. The acetonitrile solvent molecules do not accept hydrogen bonds from the –NH2 groups of the ethidium ions.
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