ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28OC%28CCN1CCOCC1%29C%29C3%28c2ccccc2%29CCOCC3/file?format=sdf&get3d=True  -- O%3DC%28OC%28CCN1CCOCC1%29C%29C3%28c2ccccc2%29CCOCC3 could not be loaded.