ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H6O3/c1-3(5)2-4(6)7/h2,5H,1H3,(H,6,7)/b3-2-/file?format=sdf&get3d=True -- InChI=1S/C4H6O3/c1-3(5)2-4(6)7/h2,5H,1H3,(H,6,7)/b3-2- could not be loaded.