2933399079 Chinese tariffs HS code 1-tert-butoxycarbonyl-4-oxo-3-piperidinecarboxylic acid methyl ester, 1-tert-butoxycarbonyl-4-oxo-3-piperidinecarboxylic acid ethyl ester, 4-hydroxypiperidine and its carbamate derivatives, amide derivatives, sulfonyl derivatives, or derivatives formed by combinations of the above derivation methods, as well as salts of all the aforementioned substances
1-tert-butoxycarbonyl-4-oxo-3-piperidinecarboxylic acid methyl ester, 1-tert-butoxycarbonyl-4-oxo-3-piperidinecarboxylic acid ethyl ester, 4-hydroxypiperidine and its carbamate derivatives, amide derivatives, sulfonyl derivatives, or derivatives formed by combinations of the above derivation methods, as well as salts of all the aforementioned substances