ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28%5BC%40H%5D%28CC1%3DCNC%3DN1%29N%29O/file?format=sdf&get3d=True  -- O%3DC%28%5BC%40H%5D%28CC1%3DCNC%3DN1%29N%29O could not be loaded.