ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN1C%3DCN%3DC1CC2COC3%3DCC%3DCC%3DC3O2/file?format=sdf&get3d=True  -- CCN1C%3DCN%3DC1CC2COC3%3DCC%3DCC%3DC3O2 could not be loaded.