400 MHz Nuclei (ppm) A 1.89 62.1 2.0 1.9 B 2.00 2.0 100 MHz Interaction J (Hz AB BC 2.1 2.0 9 2 THNMR YANTHNMR YAN Nuclei (ppm) A 1.89 B 2.00 C 2.08 Interaction J (Hz) AB 4 BC 8