ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC12CCC3C%28C1CC%3DC2%29CCC4C3%28CCC%28%3DO%29C4%29C/file?format=sdf&get3d=True -- CC12CCC3C%28C1CC%3DC2%29CCC4C3%28CCC%28%3DO%29C4%29C could not be loaded.