ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/BF4.NO2/c2-1%283%2C4%295/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/BF4.NO2/c2-1%283%2C4%295 could not be loaded.