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