ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DCC%28%3DO%29C2%3DCC%3DCC%3DC2C1%3DO/file?format=sdf&get3d=True  -- CC1%3DCC%28%3DO%29C2%3DCC%3DCC%3DC2C1%3DO could not be loaded.