ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H7NO2/c5-4(1-2-4)3(6)7/h1-2,5H2,(H,6,7)/file?format=sdf&get3d=True  -- InChI=1S/C4H7NO2/c5-4(1-2-4)3(6)7/h1-2,5H2,(H,6,7) could not be loaded.