GST rate amendment updates tariff classification and adds Diethylcarbamazine to the specified goods list, effective under Puducherry law. The amendment substitutes the tariff classification entry for S. No. 259A in Schedule I with the code '9503' and inserts Diethylcarbamazine as serial 231 in List 1; it is issued under the Puducherry Goods and Services Tax Act, 2017 and comes into force on 2 June 2021.