4-Hydroxybenzoic Acid-d4, 10mg

1,2,3,4,6,9-Hexachloro[13C12]dibenzofuran, 1.2ml x 50ug/ml, toluene

Fensulfothion, 100µg/mL in Acetonitrile, 1ml

Condensation Surrogates - Method 8261