ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28C%28N1CCCC1%29c2ccccc2%29c3ccc4CCCc4c3/file?format=sdf&get3d=True  -- O%3DC%28C%28N1CCCC1%29c2ccccc2%29c3ccc4CCCc4c3 could not be loaded.