ERROR opening https://cactus.nci.nih.gov/chemical/structure/c2c%28c1ccccc1%5BnH%5D2%29CCN3CCCC3/file?format=sdf&get3d=True  -- c2c%28c1ccccc1%5BnH%5D2%29CCN3CCCC3 could not be loaded.