ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%3DC%28C%29C%28%3DO%29OC1CC2CCC%28C1%29N2C/file?format=sdf&get3d=True  -- CC%3DC%28C%29C%28%3DO%29OC1CC2CCC%28C1%29N2C could not be loaded.