D-Alaninamide, N-acetyl-3-(1-naphthalenyl)-D-alanyl-4-chloro-D-phenylalanyl-3-(3-pyridinyl)-D-alanyl-L-seryl-L-tyrosyl-N6-(bis(ethylamino)methylene)-D-lysyl-L-leucyl-N6-(bis(ethylamino)methylene)-L-lysyl-L-prolyl-