Anti-dumping duty extension on Theophylline and Caffeine continued pending review under Customs Tariff Act provisions. The Central Government, invoking sections 9A(1), (5) and (6) of the Customs Tariff Act, 1975 and rule 23 of the Anti Dumping Rules, amends Notification No. 14/99 Customs by substituting paragraph 2 to continue the anti dumping duty on Theophylline and Caffeine originating in or exported from China PR until the newly specified expiry date unless revoked earlier, thereby preserving the duty pending review investigations.