ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/Cu.2N3/c;2*1-3-2/q+2;2*-1/file?format=sdf&get3d=True -- InChI=1S/Cu.2N3/c;2*1-3-2/q+2;2*-1 could not be loaded.