(1S,8R,12S,19R)-9,9,10,11,11,20,20,21,22,22-decamethyl-3,6,10,14,17,21-hexazatricyclo[17.3.1.18,12]tetracosane-23,24-dione 、 (1R,8S,12R,19R)-9,9,10,11,11,20,20,21,22,22-decamethyl-3,6,10,14,17,21-hexazatricyclo[17.3.1.18,12]tetracosane-23,24-dione 、
乙酸酐 以80%的产率得到