ODM2 Variable Name Controlled Vocabulary ODM2 Working Group A vocabulary for describing the name of Variables. Tetracene Tetracene (C18H12), a polycyclic aromatic hydrocarbon (PAH), also known as naphthacene or benz[b]anthracene Originally from the CUAHSI HIS VariableNameCV. See: http://his.cuahsi.org/mastercvreg/edit_cv11.aspx?tbl=VariableNameCV.