Chemistry, like all the natural sciences, begins with the direct observation of nature— in this case, of matter. 61363-56-2, Name is 2H-Pyran-3,5(4H,6H)-dione, molecular formula is C5H6O3. In a Patent，once mentioned of 61363-56-2, Electric Literature of 61363-56-2
The present invention is directed toward novel compounds and novel methods of use of said compounds of the formula (I), useful as nucleocapsid assembly inhibitors for the treatment of viruses, especially but not exclusively, including pregenomic RNA encapsidation inhibitors of HBV for the treatment of Hepatitis B virus (HBV) infection and related conditions. (Formula (I)) Including hydrates, solvates, pharmaceutically acceptable salts, prodrugs and complexes thereof, wherein A, R1, R2, R3, R4, R5, R6, R7, and R8 are defined herein.
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Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics