ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN1N%28C%28%3DO%29C%28%3DC1C%29N%29c2ccccc2/file?format=sdf&get3d=True  -- CN1N%28C%28%3DO%29C%28%3DC1C%29N%29c2ccccc2 could not be loaded.