ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1c3cc%28ccc3Oc2nc%28c%28cc12%29C%28%3DO%29O%29N%29C%28C%29C/file?format=sdf&get3d=True  -- O%3DC1c3cc%28ccc3Oc2nc%28c%28cc12%29C%28%3DO%29O%29N%29C%28C%29C could not be loaded.