ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C4H6O3/c1-3%285%292-4%286%297/h2H2%2C1H3%2C%28H%2C6%2C7%29/file?format=sdf&get3d=True -- InChI%3DInChI%3D1S/C4H6O3/c1-3%285%292-4%286%297/h2H2%2C1H3%2C%28H%2C6%2C7%29 could not be loaded.