A molecule containing a stable carbon atom with all four bonds directed toward the same side of the nucleus

► A stable carbon atom with all four single bonds directed toward the same side. ► The isomer of dodecahedrane H@C20H19. ► H@C20H19 corresponds to a true minimum on the potential energy hypersurface. ► The heat of formation of H@C20H19 calculated, 74.2 kcal mol−1.