ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29CCCCNC2%28c1ccccc1%29CCCCC2/file?format=sdf&get3d=True  -- O%3DC%28O%29CCCCNC2%28c1ccccc1%29CCCCC2 could not be loaded.