ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1cccc2c1c%28cn2N%28CCN%28C%29C%29C%29c3ccccc3/file?format=sdf&get3d=True -- c1cccc2c1c%28cn2N%28CCN%28C%29C%29C%29c3ccccc3 could not be loaded.