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2(1H)-Pyrazinone ring-containing natural products, flavocol, deoxymuta-aspergillic acid and finally optically active deoxyaspergillic acid, were easily synthesized by a newly developed procedure for preparation of 2(1H)-pyrazinone derivatives from dipeptidyl aldehyde hydrochlorides. The absolute configuration of natural deoxyaspergillic acid was synthetically determined as S.
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Okada et al. (1996) studied this question.
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