prov:value
| - wherein the configuration of the MeBmt residue is as shown in FIG. 3, compound 5 and R is a member selected from the group consisting of ???D, ???CH???CD-CD3, ???CD???CD-CD3, ???CH???CH???CH???CD-CD3, CD???CH???CD???CD-CD3, ???CH???CHCH???CD2, ???CD???CH???CD???CD2, ???CH???CD2, ???CD???CD2, ???CH???CH2, ???CH???CH???CD3, ???CH???CH???CH3, ???CH???CH???CH???CH???CH3, and ???CH???CH???CH???CH2 prep
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