ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C2H7N3.ClH/c1-5-2(3)4;/h1H3,(H4,3,4,5);1H/file?format=sdf&get3d=True  -- InChI=1S/C2H7N3.ClH/c1-5-2(3)4;/h1H3,(H4,3,4,5);1H could not be loaded.