19446-96-9 2,3-dihydro-4H-thiochromen-4-one 1,1-dioxide 4H-1-benzothiopyran-4-one, 2,3-dihydro-, 1,1-dioxide InChI=1/C9H8O3S/c10-8-5-6-13(11,12)9-4-2-1-3-7(8)9/h1-4H,5-6H