ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28N%5BC%40%40H%5D%28C%28C%29%28C%29C%29C%28N%29%3DO%29C1%3DNN%28CCCCCC%29C2%3DC1C%3DCC%3DC2/file?format=sdf&get3d=True  -- O%3DC%28N%5BC%40%40H%5D%28C%28C%29%28C%29C%29C%28N%29%3DO%29C1%3DNN%28CCCCCC%29C2%3DC1C%3DCC%3DC2 could not be loaded.