ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%5C1Oc3c%28/C%3DC/1%29c%28O%29c2ccoc2c3/file?format=sdf&get3d=True  -- O%3DC%5C1Oc3c%28/C%3DC/1%29c%28O%29c2ccoc2c3 could not be loaded.