procyanidin arecatannin a2 arecatannin a2 0 1154.2692 1155.036 pdb-ccd:https://pubchem.ncbi.nlm.nih.gov/substance/163311886 C60H50O24 Oc1cc(O)c2c(c1)O[C@H](c1ccc(O)c(O)c1)[C@H](O)[C@H]2c1c(O)cc(O)c2c1O[C@H](c1ccc(O)c(O)c1)[C@H](O)[C@H]2c1c(O)cc(O)c2c1O[C@H](c1ccc(O)c(O)c1)[C@H](O)[C@H]2c1c(O)cc(O)c2c1O[C@H](c1ccc(O)c(O)c1)[C@@H](O)C2 CHEBI:192503 InChI=1S/C60H50O24/c61-23-13-34(71)42-41(14-23)81-55(20-2-6-26(63)31(68)10-20)51(78)48(42)44-36(73)17-38(75)46-50(53(80)57(83-59(44)46)22-4-8-28(65)33(70)12-22)47-39(76)18-37(74)45-49(52(79)56(84-60(45)47)21-3-7-27(64)32(69)11-21)43-35(72)16-29(66)24-15-40(77)54(82-58(24)43)19-1-5-25(62)30(67)9-19/h1-14,16-18,40,48-57,61-80H,15H2/t40-,48+,49-,50+,51+,52+,53+,54+,55+,56+,57+/m0/s1 chebi_ontology QFLMUASKTWGRQE-MPCJJEQZSA-N a class of condensed tannins in the sub-class procyanidins contained in the seeds of Areca catechu also called betel nut. The arecatannin-type natural products from Ceylonese cassia bark and Areca seed are examples polyphenols by both current definitions, and fit the distinct definition of a polymeric phenol as well.