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Synthesis of monovalent constructs 12a–15a and divalent constructs 12b–15b.a
aCompounds 8, 9, and 10 were obtained as complex mixtures of stereoisomers and regioisomers. Compounds 12a–15a and 12b–15b, derived from 9 and 10, respectively, are likewise assumed to be the related mixtures of stereoisomers and regioisomers.
