ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28CCC1%29%5BC%40%40H%5D1COC2%3DCC%3DCN%3DC2/file?format=sdf&get3d=True  -- CN%28CCC1%29%5BC%40%40H%5D1COC2%3DCC%3DCN%3DC2 could not be loaded.