ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28c2cc1c%28nc%28n1%29NC%28%3DO%29OC%29cc2%29c3ccccc3/file?format=sdf&get3d=True -- O%3DC%28c2cc1c%28nc%28n1%29NC%28%3DO%29OC%29cc2%29c3ccccc3 could not be loaded.