| http://www.w3.org/ns/prov#value | - For example, the aldehyde group of either purified QA-17, QA-18, QA-21, mixtures thereof, or purified fractions obtainable from Quillaja saponaria Molina bark and containing QA-17, QA-18, and QA-21 can be reduced with a mild reducing agent, such as sodium or lithium borohydride, to give the corresponding alcohol.
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