HTS Code 2932.99 - Heterocyclic compounds with oxygen hetero-atom[s] only (excluding compounds containing unfused furan ring, whether or not hydrogenated, in the structure, and lactones, isosafrole, 1-[1,3-benzodioxol-5-yl]propan-2-one, piperonal, safrole, tetrahydrocannabinols "all isomers", and inorganic or organic compounds of mercury)