Silymarin is a kind of favonolignan compound, extracted from the seed capsule of plant Silybum marianum,It is yellow powder with a bitter taste.

• 水飞蓟素是黄酮木脂素类化合物，是从菊科药用植物水飞蓟种子的种皮中提取出来的，呈黄色粉末，味苦。