ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29CCC1%3DCNC2%3DC1C%28OCO3%29%3DC3C%3DC2/file?format=sdf&get3d=True  -- CN%28C%29CCC1%3DCNC2%3DC1C%28OCO3%29%3DC3C%3DC2 could not be loaded.