Chemistry is traditionally divided into organic and inorganic chemistry. COA of Formula: C4H8O2, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 453-20-3
Compounds of Formulae I, or pharmaceutically acceptable salts thereof: wherein R1, R2 and R3 are as defined in the specification as well as salts and pharmaceutical compositions including the compounds are prepared. They are useful in therapy, in particular in the management of pain.
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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem