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Guided by the acetylcholinesterase inhibiting activity , the bisindole alkaloid 3 ' - R / S - hydroxyvoacamine was isolated from a stem extract of Tabernaemontana divaricata , a plant used in Thailand in traditional rejuvenation remedies for improving the memory .
 Chemical: bisindole alkaloid; Chemical: 3 ' - R / S - hydroxyvoacamine
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Answer:
 Chemical: bisindole alkaloid; Chemical: 3 ' - R / S - hydroxyvoacamine