ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29C%28%3D%5BN%2B%5D%28C%29C%29On1c2c%28cccn2%29nn1.F%5BP-%5D%28F%29%28F%29%28F%29%28F%29F/file?format=sdf&get3d=True -- CN%28C%29C%28%3D%5BN%2B%5D%28C%29C%29On1c2c%28cccn2%29nn1.F%5BP-%5D%28F%29%28F%29%28F%29%28F%29F could not be loaded.