ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/Ge3N4/c4-1-7%282-5%293-6/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/Ge3N4/c4-1-7%282-5%293-6 could not be loaded.