ODM2 Variable Name Controlled Vocabulary ODM2 Working Group A vocabulary for describing the name of Variables. n-alkane, C24 C24 alkane, normal (i.e. straight-chain) isomer, common name: n-Tetracosane, formula : C24H50 Originally from the CUAHSI HIS VariableNameCV. See: http://his.cuahsi.org/mastercvreg/edit_cv11.aspx?tbl=VariableNameCV.