ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1N%28CC2NCCCC2%29CCN1C3%3DCC%3DCC%3DC3/file?format=sdf&get3d=True  -- O%3DC1N%28CC2NCCCC2%29CCN1C3%3DCC%3DCC%3DC3 could not be loaded.