ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C2F2O2/c3-1%285%292%284%296/file?format=sdf&get3d=True -- InChI%3DInChI%3D1S/C2F2O2/c3-1%285%292%284%296 could not be loaded.