4-hydroxyproline

4-hy·drox·y·pro·line (4Hyp, Hyp),

(hī-drok'sē-prō'lēn), 4-hydroxy-2-pyrrolidinecarboxylic acid; the trans-l-isomer is a pyrrolidine found among the hydrolysis products of collagen; not found in proteins other than those of connective tissue. A vitamin C deficiency will result in impaired formation of hydroxyproline.