Chapter 10 Anti-crease HH O 十 Nh CNH2+ C+-_NH c-NH2 CH OH ■■ OH O NH,.OH +H4 Chapter 10 Anti-crease C O N H NH C O H H H C O N H NH CH OH N H C NHCH OH H O 2 2 + + 2 2 + 2 ¨ 2 + 2 +