ERROR opening https://cactus.nci.nih.gov/chemical/structure/Oc1c%28cccc1C%28C%29%28C%29C%29C%28C%29%28C%29C/file?format=sdf&get3d=True  -- Oc1c%28cccc1C%28C%29%28C%29C%29C%28C%29%28C%29C could not be loaded.