ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DNC%28%3DC%28C%28%3DN1%29Cl%29NC2%3DNCCN2%29OC/file?format=sdf&get3d=True  -- CC1%3DNC%28%3DC%28C%28%3DN1%29Cl%29NC2%3DNCCN2%29OC could not be loaded.