ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%20%28C1C%20%28C%20%28C%20%28C%20%28O1%29%20O%29%20O%29%20O%29%20O%29%20O/file?format=sdf&get3d=True -- C%20%28C1C%20%28C%20%28C%20%28C%20%28O1%29%20O%29%20O%29%20O%29%20O%29%20O could not be loaded.