ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC+%28Oc1ccccc1C+%28%3DO%29+O%29+C/file?format=sdf&get3d=True -- O%3DC+%28Oc1ccccc1C+%28%3DO%29+O%29+C could not be loaded.