procyanidin b5 procyanidin b5 procyanidin b5 is a b type proanthocyanidin. procyanidin b5 names iupac name -(4→6)- systematic iupac name (2r,2′r,3r,3′r,4s)-2,2′-bis(3,4-dihydroxyphenyl)-3,3′,4,4′-tetrahydro-2h,2′h--3,3′,5,5′,7,7′-hexol other names procyanidin b5 identifiers cas number 12798-57-1 y 3d model (jsmol) interactive image chebi chebi:75621 chembl chembl506487 chemspider 110533 kegg c17640 pubchem cid 124017 unii w51n19h6k6 y comptox dashboard (epa) dtxsid00155761 inchi inchi=1s/c30h26o12/c31-13-7-19(36)24-23(8-13)42-30(12-2-4-16(33)18(35)6-12)28(40)26(24)25-20(37)10-22-14(27(25)39)9-21(38)29(41-22)11-1-3-15(32)17(34)5-11/h1-8,10,21,26,28-40h,9h2/t21-,26-,28-,29-,30-/m1/s1key: gmiszfqpfdapgi-cvjzbmgusa-ninchi=1/c30h26o12/c31-13-7-19(36)24-23(8-13)42-30(12-2-4-16(33)18(35)6-12)28(40)26(24)25-20(37)10-22-14(27(25)39)9-21(38)29(41-22)11-1-3-15(32)17(34)5-11/h1-8,10,21,26,28-40h,9h2/t21-,26-,28-,29-,30-/m1/s1key: gmiszfqpfdapgi-cvjzbmgubo smiles o1cc2c(o1c1ccc(o)c(o)c1)cc(o)c(1(o)(oc3cc(o)cc(o)c13)c1ccc(o)c(o)c1)c2o properties chemical formula c30h26o12 molar mass 578.52 g/mol except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). y verify (what is yn ?) infobox references procyanidin b5 is an epicatechin-(4β → 6)-epicatechin dimer. natural occurrences it can be found in grape seeds, in hibiscus cannabinus (kenaf) root and bark, and in black chokeberries (aronia melanocarpa). presence in food it is found in cocoa beans and chocolate.