ERROR opening https://cactus.nci.nih.gov/chemical/structure/Oc1cc%28cc%28O%29c1%29C%28O%29CNC%28C%29C/file?format=sdf&get3d=True  -- Oc1cc%28cc%28O%29c1%29C%28O%29CNC%28C%29C could not be loaded.