ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28CC%29/C%28C%29%3DN/P%28%3DO%29%28F%29OCC/file?format=sdf&get3d=True  -- CCN%28CC%29/C%28C%29%3DN/P%28%3DO%29%28F%29OCC could not be loaded.