ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28c1cnn2c%28ccnc12%29c3ccncc3%29c4ncccc4/file?format=sdf&get3d=True  -- O%3DC%28c1cnn2c%28ccnc12%29c3ccncc3%29c4ncccc4 could not be loaded.