Procyanidin A1 is an A type proanthocyanidin dimer.

It is an epicatechin-(2β→7,4β→8)-catechin dimer found in Rhododendron spiciferum,[1] in peanut skins[2] and in Ecdysanthera utilis.

[3] Procyanidin B1 can be converted into procyanidin A1 by radical oxidation using 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals under neutral conditions.

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