Internal standard substance: 2,6 dichloro-α-(4-chlorophenyl)-4-(4,5 dihydro-3,5-dioxo-1,2,4-triazine-2 (3H) — yl) α-methylbenzene-acetonitrile
Étalon interne: 2,6 dichloro-a-(4-chlorophényl)-4-(4,5 dihydro-3,5-dioxo-1,2,4-triazine-2 (3H)-yl) α-méthylbenzène-acétonitrile.