ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H8N2S2/c1-5-3(7)4(8)6-2/h1-2H3,(H,5,7)(H,6,8)/file?format=sdf&get3d=True  -- InChI=1S/C4H8N2S2/c1-5-3(7)4(8)6-2/h1-2H3,(H,5,7)(H,6,8) could not be loaded.