GST classification amendment: tariff code substitution and addition of Diethylcarbamazine under GST law, effective from early June. The State GST rate notification substitutes the Schedule I entry for item 259A by replacing column (2) with tariff heading '9503' and inserts 'Diethylcarbamazine' as serial 231 in List 1; the amendment affects applicability of the 2.5% State GST rate to those goods and is deemed effective from 2 June 2021.