ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1OC%28c2ccccc12%29%28c3ccc%28O%29cc3%29c4ccc%28O%29cc4/file?format=sdf&get3d=True  -- O%3DC1OC%28c2ccccc12%29%28c3ccc%28O%29cc3%29c4ccc%28O%29cc4 could not be loaded.