ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29CNC%28C%29%28C%29COC%28%3DO%29c1ccccc1/file?format=sdf&get3d=True  -- CC%28C%29CNC%28C%29%28C%29COC%28%3DO%29c1ccccc1 could not be loaded.