ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DC%28C2%3DCC%3DCC%3DC2C%28%3DC1%29N%29N/file?format=sdf&get3d=True  -- CC1%3DC%28C2%3DCC%3DCC%3DC2C%28%3DC1%29N%29N could not be loaded.