Heptachlor-exo-epoxide, 100 µg/ml, Methanol, 1ml

Phenazone impurity A, 25mg

3,3',5,5'-Tetrabromobisphenol-A [rings; 13C12], 50µg/ml in MeOH, 1,2ml

4-Chloro-3-nitrotoluene, 250mg