ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/CN.Na/c1-2%3B/q-1%3B%201/file?format=sdf&get3d=True -- InChI%3DInChI%3D1S/CN.Na/c1-2%3B/q-1%3B%201 could not be loaded.