ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC1%3DCC%3DCC%3DC1/C%3DN/CC%28C%29/N%3DC/C2%3DCC%3DCC%3DC2O/file?format=sdf&get3d=True  -- OC1%3DCC%3DCC%3DC1/C%3DN/CC%28C%29/N%3DC/C2%3DCC%3DCC%3DC2O could not be loaded.