A single pyridine intermediate feeds four different neonicotinoid insecticides. A single pyrazole acid feeds a whole family of SDHI fungicides. This isn't coincidence — it's the Reaction Interface Economy, the organizing logic behind modern agrochemical R&D and its supply chain.

Toxic

Harmful

Environmental Hazard

Danger

H301Toxic if swallowed

H302Harmful if swallowed

H317May cause an allergic skin reaction

H411Toxic to aquatic life with long lasting effects

H336May cause drowsiness or dizziness

Customs Tariff Classification

The international HS code for 2,3,5,6-TETRACHLOROPYRIDINE (CAS 2402-79-1) is 2933.39.

HS code (international, 6-digit)

2933.39

EU CN code (8-digit)

2933 39 20

Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.

Identifiers

IUPAC Name

2,3,5,6-tetrachloropyridine

InChIKey

FATBKZJZAHWCSL-UHFFFAOYSA-N

SMILES

C1=C(C(=NC(=C1Cl)Cl)Cl)Cl

Synonyms (5)

2,3,5,6-TETRACHLOROPYRIDINE
2,5,6-Tetrachloropyridine
Pyridine,3,5,6-tetrachloro-
Tetrachloropyridine, 2,3,5,6-

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2,3,5,6-TETRACHLOROPYRIDINE

Related Compounds

Related Reading

Safety Reference

Customs Tariff Classification