2930.20 - Thiocarbamates and dithiocarbamates:

This HTS category, 2930.20, specifically covers thiocarbamates and dithiocarbamates. These are organic compounds characterized by the presence of a sulfur atom doubly bonded to a carbon atom, which is in turn bonded to both a nitrogen atom and a sulfur atom (dithiocarbamates) or to a nitrogen atom and an oxygen atom (thiocarbamates). They often function as intermediates in the synthesis of pesticides, herbicides, vulcanization accelerators for rubber, and certain pharmaceuticals.

Distinguishing this category from its siblings, it's important to note that while other entries in 2930.20 and its adjacent codes (like 2930.30 for thiuram mono-, di- or tetrasulfides, or 2930.40.00.00 for methionine) also involve organo-sulfur compounds, they represent distinct chemical structures and functional groups. For example, thiuram sulfides are characterized by sulfur bridges between two nitrogen-containing groups, while thiocarbamates and dithiocarbamates possess a direct carbon-sulfur double bond within their functional group.

The subcategories within 2930.20 are structured to differentiate between aromatic and non-aromatic (other) thiocarbamates and dithiocarbamates. This distinction is crucial for classification as the presence of an aromatic ring can influence the chemical properties, reactivity, and intended uses of the compound, leading to different tariff treatments. Understanding this structural difference is key to accurately assigning the correct HTS sub-code.