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