ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H6N2/c1-2-4-6-8-7-5-3-1/h1-6H/b2-1?,3-1-,4-2-,5-3?,6-4?,7-5-,8-6-,8-7-/file?format=sdf&get3d=True  -- InChI=1S/C6H6N2/c1-2-4-6-8-7-5-3-1/h1-6H/b2-1?,3-1-,4-2-,5-3?,6-4?,7-5-,8-6-,8-7- could not be loaded.