ERROR opening https://cactus.nci.nih.gov/chemical/structure/OCCH%28O%29CH1OC%28%3DO%29C%28%3DC1O%29O/file?format=sdf&get3d=True  -- OCCH%28O%29CH1OC%28%3DO%29C%28%3DC1O%29O could not be loaded.