ERROR opening https://cactus.nci.nih.gov/chemical/structure/c3cc2c%28%5CC%3DC%28/c1c%28cccc1%29N2C%29CCNC%29cc3/file?format=sdf&get3d=True  -- c3cc2c%28%5CC%3DC%28/c1c%28cccc1%29N2C%29CCNC%29cc3 could not be loaded.