ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CCN%28CC1%29C%28%3DO%29/C%3DC/C2%3DCC3%3DC%28C%3DC2%29OCO3/file?format=sdf&get3d=True  -- C1CCN%28CC1%29C%28%3DO%29/C%3DC/C2%3DCC3%3DC%28C%3DC2%29OCO3 could not be loaded.