Chemistry is traditionally divided into organic and inorganic chemistry. Computed Properties of C21H21NO4, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 179162-55-1
The process route of the invention is greatly shortened by directly taking terephthalic acid. monoester as a raw material, and has the advantages of, avoiding preparation and use of toxic and. high-pollution precious metal catalyst, avoiding excessive reaction, and avoiding excessive reaction. (by machine translation)
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Reference：
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem