Chemistry is traditionally divided into organic and inorganic chemistry. COA of Formula: C5H6O4, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 21461-84-7
The invention provides certain benzoxazine compounds of the Formula (I) or pharmaceutically acceptable salts thereof, wherein R1, R2, Ra1, Ra2, Rb1, Rb2, Rc, Rd, and Cy are as defined herein. The invention also provides pharmaceutical compositions comprising such compounds of the Formula (I) or pharmaceutically acceptable salts thereof, and methods of using the compounds of the Formula (I) or pharmaceutically acceptable salts thereof or pharmaceutical compositions comprising the same for treating diseases or conditions mediated by RORgammaT.
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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem