ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCN%28CCC%29C1CC2%3DCC%3DCC3%3DCC%28%3DCC%28%3DC23%29C1%29O/file?format=sdf&get3d=True -- CCCN%28CCC%29C1CC2%3DCC%3DCC3%3DCC%28%3DCC%28%3DC23%29C1%29O could not be loaded.