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Heading 2935 : Sulphonamides.


Sulphonamides have the general formula (R1.SO2.N.R2.R3) where R1 is an organic radical of varying complexity having a carbon atom directly attached to the SO2 group and R2 and R3 are either : hydrogen, another atom or an inorganic or organic radical of varying complexity (including double bonds or rings). Many are used in medicine as powerful bactericides. They include, inter alia :

(1) o-Toluenesulphonamide.

(2) o-Sulphamoylbenzoic acid.

(3) p-Sulphamoylbenzylamine.

(4) p-Aminobenzenesulphonamide (NH2.C6H4.SO2.NH2) (sulphanilamide).

(5) p-Aminobenzenesulphonacetamide.

(6) Sildenafil citrate.

(7) Sulphapyridine (INN) or p-aminobenzenesulphonamidopyridine.

(8) Sulphadiazine (INN) or p-aminobenzenesulphonamidopyrimidine.

(9) Sulphamerazine (INN) or p-aminobenzenesulphonamidomethylpyrimidine.

(10) Sulphathiourea (INN) or p-aminobenzenesulphonamidothiourea.

(11) Sulphathiazole (INN) or p-aminobenzenesulphonamidothiazole.

(12) Chlorinated sulphonamides whether or not the chlorine atom is directly linked to nitrogen (e.g., sulphonchloramides or N-chlorosulphonamides, known as chloramines ; chloro¡©thiazide or 6-chloro-7-sulphamoylbenzo-1,2,4-thiadiazine 1,1-dioxide; 6-chloro-3,4-dihydro-7-sulphamoylbenzo-1,2,4-thiadiazine 1,1-dioxide).
This heading excludes compounds in which all of the S-N bonds of the sulphonamide group(s) are part of a ring. They are other heterocyclic compounds (sultams) of heading 29.34.

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