ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28c2ccc%28O%29cc2%29%28C%29c1ccc%28O%29cc1/file?format=sdf&get3d=True  -- CC%28c2ccc%28O%29cc2%29%28C%29c1ccc%28O%29cc1 could not be loaded.