ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29%28C%29C%28CCC1%3DCC%3DC%28C%3DC1%29Cl%29%28CN2C%3DNC%3DN2%29O/file?format=sdf&get3d=True -- CC%28C%29%28C%29C%28CCC1%3DCC%3DC%28C%3DC1%29Cl%29%28CN2C%3DNC%3DN2%29O could not be loaded.