GST classification change: substitution of a tariff entry and addition of Diethylcarbamazine altering state tax applicability. The notification substitutes the column (2) entry at Schedule I, 2.5% rate, S. No. 259A with '9503', and inserts Diethylcarbamazine as serial 231 in List 1; the amendments are effective from 2 June 2021 under the State GST rate-making authority.