2,3-dihydro-4H-thiochromen-4-one 1-oxide 4H-1-benzothiopyran-4-one, 2,3-dihydro-, 1-oxide InChI=1/C9H8O2S/c10-8-5-6-12(11)9-4-2-1-3-7(8)9/h1-4H,5-6H