Geodiamolide A L-Alanine, N-[N-[N-(8-hydroxy-2,4,6-trimethyl-1-oxo-4- nonenyl)-L-alanyl]-3-iodo-N-methyl-D-tyrosyl]-, .pi.-lactone, [2S-(2R*,4E,6S*,8R*)]- NSC682308