ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C18H16/c1(5-11-17-13-7-3-8-14-17)2-6-12-18-15-9-4-10-16-18/h1-16H/b2-1+,11-5+,12-6+/file?format=sdf&get3d=True  -- InChI=1S/C18H16/c1(5-11-17-13-7-3-8-14-17)2-6-12-18-15-9-4-10-16-18/h1-16H/b2-1+,11-5+,12-6+ could not be loaded.