Assertion: periwinkle's alkaloid | /r/HasProperty | ervine
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Source sentences:
text: Other alkaloids include reserpine, reserpinine, akuammicine, majdine, vinerine, ervine, vineridine, tombozine, vincamajine, vincanine, vincanidine, vincamone, apovincamine, vincaminol, desoxyvincaminol, vincorine and perivincine.