9902.05.36 - (4-Morpholinylmethylene)bis(phosphonic acid) (CAS No. 32545-75-8) (provided for in subheading 2931.90.60)

This HTS category, 9902.05.36, specifically classifies (4-Morpholinylmethylene)bis(phosphonic acid), identified by CAS No. 32545-75-8. This chemical compound, which is primarily used in industrial applications, falls under the purview of temporary legislation and special provisions within Chapter 99 of the Harmonized Tariff Schedule. Its inclusion here signifies a specific, temporary trade modification or restriction, rather than a standard, ongoing tariff classification.

It is crucial to differentiate this specific entry from the vast array of primary commodity classifications found in earlier chapters of the HTS, such as live animals (Chapters 01), dairy products (Chapter 04), or even basic chemicals. While the chemical substance itself might otherwise fall under a subheading like 2931.90.60 within Chapter 29 (Organic Chemicals), its presence in Chapter 99 indicates a special trade status dictated by temporary measures, trade agreements, or specific import restrictions enacted under provisions like Section 22 of the Agricultural Adjustment Act.

As this is a leaf node within the HTS, there are no further subcategories for this specific code. Therefore, the classification is precise and does not branch into more detailed product groupings. Classification professionals should refer to the specific notes and proclamations associated with Chapter 99 to fully understand the implications and requirements for importing or exporting goods designated under this particular HTS code.