ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1cc3c%28cc1%29CCc2c%28cccc2%29N3CCCN%28C%29C/file?format=sdf&get3d=True  -- c1cc3c%28cc1%29CCc2c%28cccc2%29N3CCCN%28C%29C could not be loaded.