ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H4/c1-2-3(1)4(1)2/h1-4H/file?format=sdf&get3d=True -- InChI=1S/C4H4/c1-2-3(1)4(1)2/h1-4H could not be loaded.