ERROR opening https://cactus.nci.nih.gov/chemical/structure/CNC%28%3DO%29Oc1cccc2CC%28C%29%28C%29Oc12/file?format=sdf&get3d=True  -- CNC%28%3DO%29Oc1cccc2CC%28C%29%28C%29Oc12 could not be loaded.