ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC%28N%28C1%3DCC%3DCC%3DC1%29%5BC%40%40H%5D%28CN2CCCCC2%29C%29%3DO/file?format=sdf&get3d=True -- CCC%28N%28C1%3DCC%3DCC%3DC1%29%5BC%40%40H%5D%28CN2CCCCC2%29C%29%3DO could not be loaded.