ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C2H8NO4P/c3-1-2-7-8(4,5)6/h1-3H2,(H2,4,5,6)/file?format=sdf&get3d=True  -- InChI=1S/C2H8NO4P/c3-1-2-7-8(4,5)6/h1-3H2,(H2,4,5,6) could not be loaded.