ERROR opening https://cactus.nci.nih.gov/chemical/structure/Oc1ccc%28cc1%29N%3DC2C%3DCC%28%3DO%29C%3DC2/file?format=sdf&get3d=True  -- Oc1ccc%28cc1%29N%3DC2C%3DCC%28%3DO%29C%3DC2 could not be loaded.