ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29c1c%28C%29n%28C%29n%28-c2ccccc2%29c1%3DO/file?format=sdf&get3d=True  -- CN%28C%29c1c%28C%29n%28C%29n%28-c2ccccc2%29c1%3DO could not be loaded.