ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%3DNC%28%3DO%29C2%3DC%28N1%29N%28C%3DN2%29C3C%28C%28C%28O3%29COP%28%3DO%29%28O-%29O-%29O%29O.Na%20.Na%20/file?format=sdf&get3d=True -- C1%3DNC%28%3DO%29C2%3DC%28N1%29N%28C%3DN2%29C3C%28C%28C%28O3%29COP%28%3DO%29%28O-%29O-%29O%29O.Na%20.Na%20 could not be loaded.