159404-79-2 AIDS-029505 AIDS029505 CYCLOPEPTOLIDE DER. L-Tyrosine, N-[N-[N-[N-[N-[N-[N-[N-[[1-(2-hydroxy-1-oxopropyl)-L-2-piperidinyl]carbonyl]-N-methyl-L-valyl]-L-valyl]-N-methyl-L-a-aspartyl]-N-methyl-L-isoleucyl]-N-methyl-L-isoleucyl]glycyl]-N-methyl-L-valyl]-O-methyl-, .delta.1-lactone, (S)-