ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCC%3DCCC%3DCCCCCCCCC%28%3DO%29CC%28COC%28%3DO%29C%29O/file?format=sdf&get3d=True -- CCCCCC%3DCCC%3DCCCCCCCCC%28%3DO%29CC%28COC%28%3DO%29C%29O could not be loaded.