ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H7NO2/c1-3(6)2-4(5)7/h2H2,1H3,(H2,5,7)/file?format=sdf&get3d=True  -- InChI=1S/C4H7NO2/c1-3(6)2-4(5)7/h2H2,1H3,(H2,5,7) could not be loaded.