ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29%28C%29c1ccc%28cc1%29c2nnc%28o2%29c3ccc%28cc3%29c4ccccc4/file?format=sdf&get3d=True  -- CC%28C%29%28C%29c1ccc%28cc1%29c2nnc%28o2%29c3ccc%28cc3%29c4ccccc4 could not be loaded.