Structure of 166702. Cyclo(N-methyl-L-alanyl-L-leucyl-α,β-didehydro-N-methylphenylalanylglycyl); 1,4,7,10-Tetraazacyclododecane Cyclic Peptide Deriv.; (Z)-Cyclic(N-methyl-L-alanyl-L-leucyl-α,β-didehydro-N-methylphenylalanylglycyl)