ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28%5BC%40H%5D1CCC%28/C%3DN/O%29%3DCC1%29%3DC/file?format=sdf&get3d=True -- CC%28%5BC%40H%5D1CCC%28/C%3DN/O%29%3DCC1%29%3DC could not be loaded.