Figure 2.
Pyrrolizidine alkaloids; 1: 7-angeloylretronecine, 2: 9-angeloylretronecine, 3: 3′-acetylrinderine, 4; rinderine, 5: intermedine, 6: rinderine N-oxide, 7: intermedine N-oxide, 8: 1,2-dehydropyrrolizine alkaloid.
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