2,3,3',4,4',5’,6-Heptachlorobiphenyl

Metformin hydrochloride, 100 µg/ml, Methanol, 1m

n-Eicosane, ?13C: -33.06, 150ug/ml, Solvent-cyclohexane, Unit 1mL, # of units-10, Cas.no. 112-95-8

Melamine (13C3,99%; Amino-15N3,98%) 100 µg/mL in Water, 1,2ml