Isovaleric acid Back Catalog number: 72417 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended DF-IS-I Mass-Labelled PCDF Internal Standard Solution, 1.2ml, nonane Price on request T4CPM Tris(4-chlorophenyl)methane, 1.2ml x 50ug/ml, nonane Price on request 675387 2-Methylnaphthalene, 10.0 µg/ml, Acetonitrile, 1 Price on request