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We have synthesized liquid crystal (LC) mesogens based on a nonlinear oxadiazole unit that exhibit nematic phases near 200 C. Polarized microscopy and conoscopy indicate that these LCs are biaxial nematics. Unambiguous and quantitative evidence for biaxiality is achieved using H 2 NMR spectroscopy.“2D powder” spectra, obtained by rotating H 2-labeled samples about an axis perpendicular to the magnetic field at∼ 200 Hz, yield phase biaxiality parameters of∼ 0.1 when coupled with rigorous and proven simulations.