ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CN%28CCN1%29C2%3DC3C%28%3DCC%3DC2%29OCCO3/file?format=sdf&get3d=True  -- C1CN%28CCN1%29C2%3DC3C%28%3DCC%3DC2%29OCCO3 could not be loaded.