2917140000 under HS Code POLYCARBOXYLIC ACIDS, THEIR ANHYDRIDES, HALIDES, PEROXIDES AND PEROXYACIDS; THEIR HALOGENATED, SULPHONATED, NITRATED OR NITROSATED DERIVATIVES - ACYCLIC POLYCARBOXYLIC ACIDS, THEIR ANHYDRIDES, HALIDES, PEROXIDES, PEROXYACIDS AND THEIR DERIVATIVES : MALEIC ANHYDRIDE and 2933610000 under HS Code HETEROCYCLIC COMPOUNDS WITH NITROGEN HETEROATOM( S) ONLY - COMPOUNDS CONTAINING AN UNFUSED TRIAZINE RING (WHETHER OR NOT HYDROGENATED) IN THE STRUCTURE : MELAMINE were the top imported HS Codes by CHEMTRAIL LLC in 2023.