Polypeptides

The repeating sequence is -NH-CRR'-CO-. The amino acids commonly found in proteins have R' = H. The polymer may be chiral if R and R' are different. The following polypeptides, or poly(alpha-amino acids), are discussed elsewhere.

• Polyalanine R = CH₃, R' = H
• Poly(alpha-aminoisobutyric acid), R = R' = CH₃
• Poly(glutamic acid), R = CH₂ CH₂COOH, R' = H
• Polyglycine, R = R' = H
• Polylysine, R = CH₂CH₂CH₂CH₂NH₂, R' = H
• Polyproline, N-C^alpha bond part of a five-membered pyrrolidine ring, R' = H
• Polytyrosine R = CH₂C₆H₄OH, R' = H

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