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