2930.70.00.00 - Bis(2-hydroxyethyl)sulfide (thiodiglycol (INN))

This HTS category, 2930.70.00.00, specifically classifies Bis(2-hydroxyethyl)sulfide, more commonly known as thiodiglycol (INN). Thiodiglycol is an organo-sulfur compound characterized by the presence of a sulfide linkage (-S-) connecting two hydroxyethyl groups (-CH2CH2OH). Its chemical structure and dual functionality as both a sulfur-containing compound and an alcohol are key to its identification.

Within the broader scope of organo-sulfur compounds under heading 2930, this specific subheading distinguishes itself by its unique molecular structure. For instance, it differs from sibling categories such as thiocarbamates and dithiocarbamates (2930.20) which contain nitrogen atoms directly bonded to sulfur in a thiocarbonyl group, and thiuram mono-, di-, or tetrasulfides (2930.30) which feature multiple sulfur atoms linked together. While other organo-sulfur compounds like methionine (2930.40.00.00) are amino acids, thiodiglycol is defined by its diol structure and sulfide linkage.

As a leaf node in the HTS classification system, 2930.70.00.00 has no further subcategories. This means that any import or export falling under the description of Bis(2-hydroxyethyl)sulfide or thiodiglycol (INN) will be directly classified to this specific 10-digit code, provided it meets all descriptive and legal requirements. Classification relies on confirming the identity of the chemical substance.