ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C3H4O4/c4-2(5)1-3(6)7/h1H2,(H,4,5)(H,6,7)/file?format=sdf&get3d=True  -- InChI=1S/C3H4O4/c4-2(5)1-3(6)7/h1H2,(H,4,5)(H,6,7) could not be loaded.