84107-30-2 Cyclic(L-alanyl-L-prolyl-D-phenylalanyl-L-prolyl), compd. with cyclic(L-alanyl-L-prolyl-L-phenylalanyl-L-prolyl) (1:1) Cyclo(L-ala-L-pro-D-phe-L-pro) Cyclo(L-ala-L-pro-L-phe-L-pro) Cyclo(ala-pro-phe-pro) Cyclo(alanyl-prolyl-phenylalanyl-proline)