Kucha(Camellia assamica var.kucha) is a special wild tea resource,containing 1,3,7,9-tetramethyluric acid(theacrine) as the predominant purine alkaloid in the leaves.

• 苦茶是一种特殊的茶组植物,它以1,3,7,9-四甲基尿酸为主要的嘌呤生物碱。