L-tyrosine, N-[1-[N-[4-[[3-Hydroxy-4-[[N-[N-[1-(2-hydroxy-1-oxopropyl)- L-prolyl]-N-methyl-L-leucyl]-L-threonyl]amino-5-methyl-1-oxoheptyl]oxy]-2,5-dimethyl-1,3-dioxohexyl]-L-leucyl]- L-prolyl]-N,O-dimethyl-, .phi.-lactone (9CI)