2-butanone, 4-(2-benzofuranyl)-3-(phenylsulfonyl)- 4-(1-benzofuran-2-yl)-3-(phenylsulfonyl)butan-2-one InChI=1/C18H16O4S/c1-13(19)18(23(20,21)16-8-3-2-4-9-16)12-15-11-14-7-5-6-10-17(14)22-15/h2-11,18H,12H2,1H