ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1/C3H6N2O/c6-3-4-1-2-5-3/h1-2H2,(H2,4,5,6)/file?format=sdf&get3d=True  -- InChI=1/C3H6N2O/c6-3-4-1-2-5-3/h1-2H2,(H2,4,5,6) could not be loaded.