4H-1-benzopyran-4-one, 7-hydroxy-3-(3-thienyl)- 7-hydroxy-3-(3-thienyl)-4H-chromen-4-one InChI=1/C13H8O3S/c14-9-1-2-10-12(5-9)16-6-11(13(10)15)8-3-4-17-7-8/h1-7,14