ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/2CN.Zn/c2*1-2;/q2*-1;+2/file?format=sdf&get3d=True -- InChI=1S/2CN.Zn/c2*1-2;/q2*-1;+2 could not be loaded.