酯甙

甙元以羧基和糖的端基碳相連線的俄類是酯甙。酯甙的甙鍵既有縮醛性質又有酯的性質，易為稀酸和稀鹼水解。

例如山慈菇甙A和B即為酯甙，有抗黴菌活性。