ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29%28C%28%3DO%29N%5BC%40%40H%5D%28CC1%3DCNC%3DN1%29C%28%3DO%29N%5BC%40H%5D%28CC2%3DCC3%3DCC%3DCC%3DC3C%3DC2%29C%28%3DO%29N%5BC%40H%5D%28CC4%3DCC%3DCC%3DC4%29C%28%3DO%29N%5BC%40%40H%5D%28CCCCN%29C%28%3DO%29N%29N/file?format=sdf&get3d=True -- CC%28C%29%28C%28%3DO%29N%5BC%40%40H%5D%28CC1%3DCNC%3DN1%29C%28%3DO%29N%5BC%40H%5D%28CC2%3DCC3%3DCC%3DCC%3DC3C%3DC2%29C%28%3DO%29N%5BC%40H%5D%28CC4%3DCC%3DCC%3DC4%29C%28%3DO%29N%5BC%40%40H%5D%28CCCCN%29C%28%3DO%29N%29N could not be loaded.