ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28NC13CC2CC%28CC%28C1%29C2%29C3%29COCCN%28C%29C/file?format=sdf&get3d=True  -- O%3DC%28NC13CC2CC%28CC%28C1%29C2%29C3%29COCCN%28C%29C could not be loaded.