ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCC%28CC%29c%28%3A%5Bo%5D%29%3A%5BoH%5D/file?format=sdf&get3d=True  -- CCCCC%28CC%29c%28%3A%5Bo%5D%29%3A%5BoH%5D could not be loaded.