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Synthesis of Dirhamnose Variant 4. Boc-6-Ahx-OH = N-Boc-6-aminohexanoic acid; brsm= based on recovered starting material; MS = molecular sieves; NHS = N-hydroxysuccinimide; PQA = protected quillaic acid (13); TBP = 2,4,6-tri-tert-butylpyridine.
