beta-Endosulfan, 100 µg/ml, Acetonitrile, 5ml

2,3,3',4,5,5'-Hexachlorobiphenyl,100 µg/mL,isooctane,1mL,

Triphenyl phosphite, 100 µg/ml, Methanol, 1ml

N-Nitroso-D,L-proline-d7