ERROR opening https://cactus.nci.nih.gov/chemical/structure/COc2ccc1ncc%28CCN%28CC%3DC%29CC%3DC%29c1c2/file?format=sdf&get3d=True  -- COc2ccc1ncc%28CCN%28CC%3DC%29CC%3DC%29c1c2 could not be loaded.