ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1CCN%28CC1N%28C%29C2%3DNC%3DNC3%3DC2C%3DCN3%29C%28%3DO%29CC/file?format=sdf&get3d=True  -- CC1CCN%28CC1N%28C%29C2%3DNC%3DNC3%3DC2C%3DCN3%29C%28%3DO%29CC could not be loaded.