title: Procyanidin B4
text: # Procyanidin B4
  
  Procyanidin B4 is a B type proanthocyanidin.
  
  Procyanidin-B4 is a catechin-(4α→8)-epicatechin dimer. It is found in the litchi pericarp, in grape seeds, and, along with 4-cis-isomer of procyanidin B4, in beer.
  
  