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The tagging plan calls for one principal fragment 3 as two enantiomers and the other principal fragment 4 as two mixtures of four quasiisomers. One of these mixtures is the 4,5-trans series and the other is the 4,5-cis series. Coupling of the two enantiomers of 3 with the two mixtures of 4 gives four mixtures of four tagged quasiisomers M-5 as penultimate precursors of the 16 true isomers of 1.
