2,4-Dichlorophenol, certified, 0.25g

13C6-2,4-D, 100µg/ml in Acetonitrile, 1ml

Ethanesulfonic acid, 100mg

2',3,4',5,5'-Pentachloro-4-[13C12]biphenylol, 1.2ml x 50ug/ml, toluene