9902.06.05 - Methyl {(2S,3R)-1-[(2S)-2-{5-[(2R,5R)-1-{3,5-difluoro- 4-[4-(4-fluorophenyl)-1-piperidinyl]phenyl}-5-(6- fluoro-2-{(2S)-1-[N-(methoxycarbonyl)-O-methyl-L-threonyl]- 2-pyrrolidinyl}-1H-benzimidazol-5-yl)- 2-pyrrolidinyl]-6-fluoro-1H-benzimidazol-2-yl}-1- pyrrolidinyl]-3-methoxy-1-oxo-2-butanyl}carbamate (Pibrentasvir) (CAS No. 1353900-92-1) (provided for in subheading 2933.39.41)

This HTS category, 9902.06.05, pertains to a specific pharmaceutical substance identified as Methyl {(2S,3R)-1-[(2S)-2-{5-[(2R,5R)-1-{3,5-difluoro-4-[4-(4-fluorophenyl)-1-piperidinyl]phenyl}-5-(6-fluoro-2-{(2S)-1-[N-(methoxycarbonyl)-O-methyl-L-threonyl]-2-pyrrolidinyl}-1H-benzimidazol-5-yl)-2-pyrrolidinyl]-6-fluoro-1H-benzimidazol-2-yl}-1-pyrrolidinyl]-3-methoxy-1-oxo-2-butanyl}carbamate, also known by its common name Pibrentasvir and CAS Number 1353900-92-1. This classification is specifically designated for this compound when it is provided for under subheading 2933.39.41, indicating its role as a drug substance.

As a leaf node within Chapter 99, this classification does not have further subdivisions. Its unique Chemical Abstracts Service (CAS) number and systematic chemical name precisely delineate the scope of this entry, distinguishing it from other potential pharmaceutical or chemical compounds that might fall under broader categories. The context of Chapter 99 signifies that this classification is part of temporary legislation or special provisions, highlighting its specific and often time-limited application within the broader Harmonized Tariff Schedule.