9 components: 1g/l each of Acetic acid [CAS:64-19-7] ; Propionic acid [CAS:79-09-4] ; Butyric Acid [CAS:107-92-6] ; Isobutyric acid [CAS:79-31-2] ; Valeric acid [CAS:109-52-4] ; Isovaleric acid [CAS:503-74-2] ; Hexanoic acid [CAS:142-62-1] ; 4-Methylvaleric acid [CAS:646-07-1] ; Heptanoic Acid [CAS:111-14-8] in Water