28311010 under HS Code DITHIONITES AND SULPHOXYLATES - OF SODIUM : SODIUM DITHIONITES (SODIUM HYDROSULPHITE), 29181400 under HS Code CARBOXYLIC ACIDS WITH ADDITIONAL OXYGEN FUNCTION AND THEIR ANHYDRIDES, HALIDES, PEROXIDES AND PEROXYACIDS; THEIR HALOGENATED, SULPHONATED, NITRATED OR NITROSATED DERIVATIVES - CARBOXYLIC ACIDS WITH ALCOHOL FUNCTION, BUT WITHOUT OTHER OXYGEN FUNCTION, THEIR ANHYDRIDES, HALIDES, PEROXIDES, PEROXYACIDS AND THEIR DERIVATIVES : CITRIC ACID, and 28319010 under HS Code DITHIONITES AND SULPHOXYLATES - OTHER : DITHIONITES were the top imported HS Codes by ALAMGIR in 2021.