for the following products
1-Acetyl-4-hydroxy-pyrrolidine-2-carboxylic acid | Ac-Hyp-OH | Ac-L-trans-Hyp-OH | N-Acetyl-L-hydroxyproline | N-Acetyl-trans-4-hydroxy-L-proline | N-alpha-Acetyl-L-4-hydroxyproline | trans-1-Acetyl-4-hydroxy-L-proline and Oxaceprol
