The first totalsynthesis of (+)- and (−)-pericosine A has been achieved, enabling the revision and determination of the absoluteconfiguration of this antitumor natural product as methyl (3S,4S,5S,6S)-6-chloro-3,4,5-trihydroxy-1-cyclohexene-1-carboxylate. Every step of this totalsynthesis proceeded well with excellent stereoselectivity. Structures of the intermediates in crucial steps were confirmed