Figure 5.
Minor diketopiperazines identified in the crude extract of A. dauci; cyclo-(pro-val) (3), cyclo-(leu-tyr) (4), cyclo-(pro-leu) (5), cyclo-(pro-phe) (6), cyclo-(val-leu) (7), cyclo-(val-phe) (8), and cyclo-(leu-phe) (9).
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