Alstotriamine A, a triamino monoterpene indole alkaloid with an unprecedented pentacyclic caged skeleton and anti-inflammatory alkaloids from Alstonia mairei.

A novel triamino monoterpene indole alkaloid, alstotriamine A (1), a new monoterpene indole alkaloid (2), and five known analogues (3-7) were isolated from the branches and leaves of Alstonia mairei. Their structures were elucidated via extensive spe…

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