Three isomeric A-type proanthocyanidins have been isolated from the root of
Prunus armeniaca. They were identified as ent-epiafzelechin-(4 alpha --> 8
; 2 alpha --> O --> 7)-epiafzelechin (mahuannin A), ent-epiafzelechin-(4 al
pha --> 8; 2 alpha --> O --> 7)-(+)-afzelechin and ent-epiafzelechin-(4 alp
ha --> 8; 2 alpha --> O --> 7)-(-)-afzelechin, by means of spectral studies
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