Let’s face it, organic chemistry can seem difficult to learn. Especially from a beginner’s point of view.40191-32-0, Name is Tetrahydro-2H-pyran-4-carbonyl chloride, molecular formula is C6H9ClO2. In a Patent，once mentioned of 40191-32-0, Synthetic Route of 40191-32-0
The present invention relates to compounds of formula (I): and pharmaceutically acceptable salts thereof, wherein R1, R2, R3, R4, R5, R6 and R7 are as defined herein. The invention also relates to pharmaceutical compositions comprising these compounds, methods of using these compounds in the treatment of various diseases and disorders, processes for preparing these compounds and intermediates useful in these processes.
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Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics