ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C20H18S/c1-4-10-17(11-5-1)16-21-20(18-12-6-2-7-13-18)19-14-8-3-9-15-19/h1-15,20H,16H2/file?format=sdf&get3d=True  -- InChI=1S/C20H18S/c1-4-10-17(11-5-1)16-21-20(18-12-6-2-7-13-18)19-14-8-3-9-15-19/h1-15,20H,16H2 could not be loaded.