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