ERROR opening https://cactus.nci.nih.gov/chemical/structure/CNCCC%28C1%3DCC%3DCC%3DC1%29OC2%3DCC%3DCC%3DC2OC/file?format=sdf&get3d=True  -- CNCCC%28C1%3DCC%3DCC%3DC1%29OC2%3DCC%3DCC%3DC2OC could not be loaded.