ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC12CC3CC%28C%29%28C1%29CC%28N%29%28C3%29C2/file?format=sdf&get3d=True  -- CC12CC3CC%28C%29%28C1%29CC%28N%29%28C3%29C2 could not be loaded.