ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DCC%28%3DCC%3DC1%29N%20%28%3DO%29O-/file?format=sdf&get3d=True  -- CC1%3DCC%28%3DCC%3DC1%29N%20%28%3DO%29O- could not be loaded.