ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1CC2%3DC%28C%28%3DCC%3DC2%29O%29C%28%3DO%29O1/file?format=sdf&get3d=True -- CC1CC2%3DC%28C%28%3DCC%3DC2%29O%29C%28%3DO%29O1 could not be loaded.