ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/4CN.2K.Ni/c4%2A1-2%3B%3B%3B/q4%2A-1%3B2%2A%201%3B%202%2C/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/4CN.2K.Ni/c4%2A1-2%3B%3B%3B/q4%2A-1%3B2%2A%201%3B%202%2C could not be loaded.