2935.90.42.00 - Salicylazosulfapyridine (Sulfasalazine); Sulfadiazine; Sulfaguanidine; Sulfamerizine; and Sulfapyridine

This HTS category, HTS Code 2935.90.42.00, specifically covers a group of sulfonamide antimicrobial drugs, including Salicylazosulfapyridine (also known as Sulfasalazine), Sulfadiazine, Sulfaguanidine, Sulfamerizine, and Sulfapyridine. These are distinct organic chemical compounds utilized for their bacteriostatic properties in treating various infections. Their classification under this code hinges on their specific chemical structure and therapeutic application as anti-infective agents within the broader group of sulfonamides.

It is crucial to differentiate this category from its sibling entries. For instance, HTS Code 2935.90.29.00 covers Acetylsulfaguanidine, a derivative that differs chemically. Similarly, 2935.90.30.00 and 2935.90.32.00 are reserved for Sulfamethazine and its sodium salt, and Acetylsulfisoxazole along with Sulfacetamide sodium respectively, each representing distinct sulfonamide compounds. HTS Code 2935.90.33.00 is for Sulfathiazole and its sodium salt. This specific category, 2935.90.42.00, therefore, acts as a precise grouping for these named, non-derivative sulfonamides, excluding other related but chemically distinct substances found at the same HTS level.

As a leaf node within the HTS structure, this category does not have further subcategories. All products fitting the description provided are classified directly under 2935.90.42.00. Classification at this level relies solely on the identification of the listed chemical names or their common pharmaceutical equivalents.