4H-1-benzopyran-4-one, 5,7-dihydroxy-3-(3-thienyl)- 5,7-dihydroxy-3-(3-thienyl)-4H-chromen-4-one 5,7-dihydroxy-3-(3-thienyl)-4H-chromene-4-one InChI=1/C13H8O4S/c14-8-3-10(15)12-11(4-8)17-5-9(13(12)16)7-1-2-18-6-7/h1-6,14-15