ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C8H8/c1-2-4-8-6-5-7(8)3-1/h1-4H,5-6H2/file?format=sdf&get3d=True  -- InChI=1S/C8H8/c1-2-4-8-6-5-7(8)3-1/h1-4H,5-6H2 could not be loaded.