Temozolomide85622-93-1100 % similar 3-Methyl-4-oxo-3,4-dihydroimidazo(5,1-d)(1,2,3,5)tetrazine-8-carbonitrile114601-31-952 % similar 1,3-Dimethyl-1H-pyrazole-5-carboxamide136678-93-833 % similar 3-Hydroxypyrazine-2-carboxamide55321-99-831 % similar Caffeine58-08-230 % similar