ERROR opening https://cactus.nci.nih.gov/chemical/structure/n3c%20%28%5CC%20%28%3DC%5CCN1CCCC1%29%20c2ccc%20%28cc2%29%20C%29%20cccc3/file?format=sdf&get3d=True  -- n3c%20%28%5CC%20%28%3DC%5CCN1CCCC1%29%20c2ccc%20%28cc2%29%20C%29%20cccc3 could not be loaded.