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