Figure 3.
Structures of 2,5-diketopiperazine maculosin-1 (cyclo(l-Pro-l-Tyr), maculosin-2 (cyclo(l-Pro-l-Phe)), cyclo(l-Pro-l-Val), cyclo(d-Pro-d-Phe), cyclo(l-Pro-l-Leu), and cyclo(d-Pro-l-Tyr) (9–14)).
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