To suspend temporarily the duty on certain drug substances used as an HIV antiviral drug.

Amends the Harmonized Tariff Schedule of the United States to suspend, through June 30, 1999, the duty on certain drug substances used as HIV antiviral drugs: (1) (S)-N-tert-butyl-1,2,3,4-tetrahydro- 3-isoquinoline carboxamide; (2) (S)-N-tert-butyl-1,2,3,4-tetrahydro-3- isoquinoline carboxamide hydrochloride salt; and (3) (S)-N-tert-butyl- 1,2,3,4- tetrahydro-3-isoquinoline carboxamide sulfate salt.