28 September 2026, Beijing: The International Organization for Standardization’s pesticide naming body has provisionally approved “prosulfopyzone” as the new common name for a novel herbicide developed by Liaoning Cynda Chemical Co. Ltd, a China based agrochemical manufacturer, according to a notice posted by the ISO 1750 Maintenance Agency on September 26, 2026. The approval, dated September 25, 2026, opens a six month public objection period that runs until March 25, 2027, after which the name becomes final if no formal objections are filed.
Prosulfopyzone belongs to the benzoylpyrazole chemical class, according to the ISO notice. Its full IUPAC chemical name is listed as 4-[2-chloro-4-(methylsulfonyl)-3-[(propylsulfonyl)methyl]benzoyl]-1,3-dimethyl-1H-pyrazol-5-yl N,N-diethylcarbamate, and it carries the CAS registry number 3121509-99-4. The compound’s Chinese common name is given as shuang feng cao zhi (双砜草酯) in the same notice. The ISO document does not specify target crops, weed spectrum, or application rates, since those details are established later through individual national registration dossiers rather than through the naming process itself.
An ISO common name is a standardized, internationally recognized identifier assigned to a pesticide active ingredient so that regulators, manufacturers, and researchers across different countries refer to the same chemical consistently on labels, safety data sheets, and registration filings, regardless of the many trade names a product may eventually carry. Provisional approval is an intermediate step: it signals that ISO’s technical committee, known as TC 81, has accepted the proposed name as chemically and linguistically sound, but the name does not become fully approved and permanently listed in the ISO 1750 standard until the objection window closes without a successful challenge, typically on grounds such as conflicts with existing trademarks or names.
For Liaoning Cynda Chemical, the provisional naming is an early but necessary milestone on the path toward commercializing prosulfopyzone outside China. Companies typically pursue an ISO common name in parallel with, or shortly before, filing for registration with China’s Institute for the Control of Agrochemicals (ICAMA) and, subsequently, with regulators in export markets. Without a settled common name, a molecule cannot easily proceed through the standardized labeling and documentation that most national pesticide authorities, including India’s Central Insecticides Board and Registration Committee, the US Environmental Protection Agency, and Brazil’s Ministry of Agriculture and Livestock, require as part of a complete registration dossier.
The emergence of prosulfopyzone adds to a steady stream of new active ingredients originating from Chinese agrochemical manufacturers in recent years, as the country’s crop protection sector has increasingly moved beyond generic manufacturing of off patent chemistries toward proprietary molecule discovery. Benzoylpyrazole chemistry has previously yielded commercially significant herbicides used for weed control in cereal crops, and a new entrant in this class is likely to draw close attention from formulators and distributors looking for fresh modes of action to manage weeds that have developed resistance to older herbicide groups.
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