ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC2C3%3DC%28C%3DCC%3DC3%29OC1%3DCC%3DCC%3DC12/file?format=sdf&get3d=True -- O%3DC2C3%3DC%28C%3DCC%3DC3%29OC1%3DCC%3DCC%3DC12 could not be loaded.