ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28OCC%28c1ccccc1%29COC%28%3DO%29N%29N/file?format=sdf&get3d=True  -- O%3DC%28OCC%28c1ccccc1%29COC%28%3DO%29N%29N could not be loaded.