2,3-dihydro-4H-thiochromen-4-one 3528-17-4 4H-1-benzothiopyran-4-one, 2,3-dihydro- InChI=1/C9H8OS/c10-8-5-6-11-9-4-2-1-3-7(8)9/h1-4H,5-6H