ยง) The RI given in the NIST MS database and by other authors as well as the mass spectrum of Tris(methylthio)methane published there and in the Wiley MS database are not correct. GC-MS of an authentic sample purchased from Aldrich revealed an RI of 1217 and a mass spectrum identical to the mass spectrum of the compound at the identical retention time from the headspace of M. hyalina .