ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DCC%28%3DO%29OC2%3DC1C%3DCC%28%3DC2%29O/file?format=sdf&get3d=True  -- CC1%3DCC%28%3DO%29OC2%3DC1C%3DCC%28%3DC2%29O could not be loaded.