HTS code 2939.61.00.00 covers "Alkaloids, natural or reproduced by synthesis, and their salts, ethers, esters and other derivatives › Caffeine and its salts › Ergometrine and its salts" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.