Withdrawal of customs duty exemption on Technitium-99m imports, restoring basic customs duty liability under the amended notification. The Central Government amends Notification No.12/2012-Customs by omitting serial number 163B and its entries from the Table, thereby withdrawing the previous exemption from Basic Customs Duty on import of Technitium-99m, as effected by Notification No.61/2016-Customs dated 27 December 2016.