US Patent 6,753,414
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
A process for preparing compounds of formula (1): including the convergent steps as defined in the specification, and wherein R groups have any of the values defined in the specification. The invention also provides processes and intermediates useful for preparing compounds of formula (1).
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Jin, Zhendong and Yu, Wensheng Process for preparing saponin compounds. US Patent 6,753,414 filed August 06, 2002 and issued June 22, 2004. https://ir.uiowa.edu/patents/358