ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H6N2S/c1-6-3-2-5-4(6)7/h2-3H,1H3,(H,5,7)/file?format=sdf&get3d=True  -- InChI=1S/C4H6N2S/c1-6-3-2-5-4(6)7/h2-3H,1H3,(H,5,7) could not be loaded.