ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28Nc1ncccc1%29Cc3ccc%28c2ccccc2%29cc3/file?format=sdf&get3d=True  -- O%3DC%28Nc1ncccc1%29Cc3ccc%28c2ccccc2%29cc3 could not be loaded.