ERROR opening https://cactus.nci.nih.gov/chemical/structure/O1c2ccc%28cc2OC1%29/C%3DC/C%28O%29C%28C%29%28C%29C/file?format=sdf&get3d=True  -- O1c2ccc%28cc2OC1%29/C%3DC/C%28O%29C%28C%29%28C%29C could not be loaded.