Three new 6,7-seco-ent-kaurane diterpenoids named epi-eriocalyxin A (2),maoecrystal N (3) and maoecrystal O (4) together with two known constituents eriocalyxin A (1) and maoecrystal L (5) were isolated from the dried leaves of Isodon eriocalyx.

• 从采自云南省江川县的毛萼香茶菜（Isodoneriocalyx）的甲醇提取物中分离得到3个新的6，7－螺断－对映－贝壳杉烷型二萜：表毛萼甲素，毛萼晶N和毛萼晶O；