77327-05-0 DIDEMNIN B L-Tyrosine, N-[1-[N-[4-[[3-hydroxy-4-[[N-[N-[1-(2-hydroxy- 1-oxopropyl)-L-propyl]-N-methyl-L-leucyl]-L-threonyl]amino]- 6-methyl-1-oxoheptyl]oxy]-2,5-dimethyl-1,3-dioxohexyl]-L-leucyl]-1-prolyl]-N,O-dimethyl-, .phi.-lactone NSC333841