ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1/Cu.2NO3/c;2*2-1(3)4/q+2;2*-1/file?format=sdf&get3d=True -- InChI=1/Cu.2NO3/c;2*2-1(3)4/q+2;2*-1 could not be loaded.