ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%28%3DNC%28%3DNC%28%3DN1%29Br%29Br%29Br/file?format=sdf&get3d=True  -- C1%28%3DNC%28%3DNC%28%3DN1%29Br%29Br%29Br could not be loaded.