Two structures have been verified by single crystal X-ray crystallography as well as by 6Li, 7Li, and 13C NMR spectroscopy.
tˈuː stɹˈʌktʃɚz hɐvbɪn vˈɛɹᵻfˌaɪd baɪ sˈɪŋɡəl kɹˈɪstəl ˈɛksɹˈeɪ kɹˌɪstɐlˈɑːɡɹəfi æz wˈɛl æz baɪ sˈɪks lˈaɪ, sˈɛvən lˈaɪ, ænd θˈɜːtiːn sˈiː ˌɛnˌɛmˈɑːɹ spɛktɹˈɑːskəpi.