Gray Matters only stars Jack Black.
Vincamine is a monoterpenoid indole alkaloid found in the leaves of Vinca minor -LRB- lesser periwinkle -RRB- , comprising about 25-65 % of the indole alkaloids found in Vinca minor by weight .. indole. indole. alkaloid. alkaloid. Vinca minor. Vinca minor. It can be synthesized from related alkaloids .