Stereocontrolled synthesis of calyculin A: construction of the C(15)–C(25) spiroketal unit
Anthony G. M. Barrett, Jeremy J. Edmunds, Kiyoshi Horita and Christopher J. Parkinson
J. Chem. Soc., Chem. Commun., 1992, 1236-1238
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http://dx.doi.org/10.1039/C39920001236