ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29COc2nn%28c1ccccc12%29Cc3ccccc3/file?format=sdf&get3d=True  -- O%3DC%28O%29COc2nn%28c1ccccc12%29Cc3ccccc3 could not be loaded.