Isovoacangine is a naturally occurring substance that has action on heart muscles in pigs.

[citation needed] 3-Hydroxyisovoacangine and 3-(2'-oxopropyl)isovoacangine are derivates of isovoacangine.

[1] It occurs naturally in many Tabernaemontana (milkwood) species such as Tabernaemontana pachysiphon and Tabernaemontana divaricata.

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