1.A definitive anti-dumping duty is imposed on imports of 2-phosphonobutane-1,2,4-tricarboxylic acid and its sodium salt Tetrasodium hydrogen 2-phosphonatobutane-1,2,4-tricarboxylate, in solid form or in an aqueous solution, currently falling under CN code 29314980 (TARIC code 2931498060), CAS RN 37971-36-1 and 66669-53-2, CUS 0027475-9 and 0087281-1, EC 253-733-5 and 266-442-3 and originating in the People’s Republic of China.