ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1C2C%28C%28C%28C%28O1%29O2%29O%29O%29O/file?format=sdf&get3d=True  -- C1C2C%28C%28C%28C%28O1%29O2%29O%29O%29O could not be loaded.