ERROR opening http://cactvs.nci.nih.gov/chemical/structure/O%3DC%28c1ccc%28F%29cc1%29c2ccc%28F%29cc2/file?format=sdf&get3d=True -- O%3DC%28c1ccc%28F%29cc1%29c2ccc%28F%29cc2 could not be loaded.