carbobenzoxyglycyl-prolyl-leucyl-glycyl-proline;N-CARBOBENZOXY-GLYCYL-PROPYL-L-LEUCYLGLYCYL-L-PROLINE;N-carbobenzyloxy-Gly-Pro-Leu-Gly-Pro;N-CBZ-GLY-PRO-LEU-GLY-PRO;CBZ-GLY-L-PRO-LEU-GLY-PRO;z-gly-pro-leu-gly-pro;Z-GLYCYL-L-PROLYL-L-LEUCYL-GLYCYL-L-PROLINE