ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC%28%3DO%29C1%28CCN%28CC1%29C%29C2%3DCC%28%3DCC%3DC2%29O/file?format=sdf&get3d=True -- CCC%28%3DO%29C1%28CCN%28CC1%29C%29C2%3DCC%28%3DCC%3DC2%29O could not be loaded.