ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1C2%3DC3C%28%3DC%28C%3DC2CCN1%29OC%29OCO3/file?format=sdf&get3d=True  -- CC1C2%3DC3C%28%3DC%28C%3DC2CCN1%29OC%29OCO3 could not be loaded.