ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28OCC%28C%29%28CCC%29COC%28%3DO%29N%29NC1CC1/file?format=sdf&get3d=True  -- O%3DC%28OCC%28C%29%28CCC%29COC%28%3DO%29N%29NC1CC1 could not be loaded.