trans-4-hydroxy-L-proline(2S,4R)-4-hydroxy-2-pyrrolidinecarboxylic acid(2S,4R)-trans-4-hydroxyprolineHydroxy-L-prolineHydroxyprolineHypHyproL-4-HydroxyprolineL-threo-4-hydroxyprolinedelta-hydroxyprolinetrans-4-Hydroxy-L-prolinetrans-4-hydroxy-L-prolinetrans-Hydroxyprolinetrans-L-Hydroxyproline