ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28N%28CC%29CC%29C1%28CC1CN%29c2ccccc2/file?format=sdf&get3d=True  -- O%3DC%28N%28CC%29CC%29C1%28CC1CN%29c2ccccc2 could not be loaded.