ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29CCC1%3DCNC2%3DC1C%3DCC%3DC2OC/file?format=sdf&get3d=True -- CN%28C%29CCC1%3DCNC2%3DC1C%3DCC%3DC2OC could not be loaded.