ERROR opening https://cactus.nci.nih.gov/chemical/structure/COc1cc%28O%29c2C%28%3DO%29C%28%3DC%28Oc2c1%29c3ccc%28O%29c%28O%29c3%29O/file?format=sdf&get3d=True  -- COc1cc%28O%29c2C%28%3DO%29C%28%3DC%28Oc2c1%29c3ccc%28O%29c%28O%29c3%29O could not be loaded.