Endosulfan-sulfate, 100 µg/ml, Methanol, 1ml

ECH Standard

Mono-n-butyl phthalate (ring-1,2-13C2, dicarboxyl-13C2, 99%) 100 µg/mL in MTBE, 1,2ml

Dexamethasone-4,6alpha,21,21-d4,neat,neat,5mg