(S)-(-)-4-异丁基氧氮杂环戊烷-2,5-二酮

carbon monoxide

cyclo(L-Pro-L-Trp-L-Ile-L-Pro-L-Leu-L-Thr-L-Pro-L-Leu)

cyclo(L-Pro-L-Trp-L-Val-L-Pro-L-Leu-L-Ile-L-Pro-L-Ile)