ERROR opening https://cactus.nci.nih.gov/chemical/structure/c3cccc2c3cccc2C%28%3DO%29c1cn%28CCCCCC%29c4c1cccc4/file?format=sdf&get3d=True  -- c3cccc2c3cccc2C%28%3DO%29c1cn%28CCCCCC%29c4c1cccc4 could not be loaded.