ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%3DCCc1ccc%28c%28c1%29c2cc%28ccc2O%29CC%3DC%29O/file?format=sdf&get3d=True  -- C%3DCCc1ccc%28c%28c1%29c2cc%28ccc2O%29CC%3DC%29O could not be loaded.