ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29%28C%28C%29%28c1ccc%28cc1%29Cl%29O%29O/file?format=sdf&get3d=True  -- CC%28C%29%28C%28C%29%28c1ccc%28cc1%29Cl%29O%29O could not be loaded.