ERROR opening https://cactus.nci.nih.gov/chemical/structure/COC1%3DC%28C2%3DC%28COC2%3DO%29C%3DC1%29OC/file?format=sdf&get3d=True  -- COC1%3DC%28C2%3DC%28COC2%3DO%29C%3DC1%29OC could not be loaded.