ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC1%3DC%28C%28OC%29%3DCC2%3DC1CN%28C%29CC2%29OC/file?format=sdf&get3d=True  -- OC1%3DC%28C%28OC%29%3DCC2%3DC1CN%28C%29CC2%29OC could not be loaded.