Chemistry is traditionally divided into organic and inorganic chemistry. HPLC of Formula: C4H3NO3, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 21169-71-1
A highly efficient [(NHC)AuI]-based (NHC = N-heterocyclic carbene) catalytic system for the carboxylation of aromatic and heteroaromatic C-H bonds was developed. The significant base strength of the Au-OH species is at the origin of the activation process and permits the facile functionalization of C-H bonds without the use of other organometallic reagents.
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Reference：
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem