pharmaceutical secondary standard; traceable to USP Synonym(s): Temozolomide; 3,4-Dihydro-3-methyl-4-oxoimidazo[5,1- d ]-1,2,3,5-tetrazine-8-carboxamide; 3-Methyl-4-oxo-8-imidazolo[5,1- d ][1,2,3,5]tetrazinecarboxamide; 4-Methyl-5-oxo-2,3,4,6,8-pentazabicyclo[4.3.0]nona-2,7,9-triene-9-carboxamide;...