ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C8H6/c1-3-7-5-2-6-8(7)4-1/h1-6H/file?format=sdf&get3d=True  -- InChI=1S/C8H6/c1-3-7-5-2-6-8(7)4-1/h1-6H could not be loaded.