{{chembox | Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 441141415 | Name = Roburin A | ImageFile = Roburin A.PNG | ImageName = Chemical structure of roburin A | ImageAlt = Chemical structure of roburin A | IUPACName = | OtherNames = |Section1={{Chembox Identifiers | CASNo_Ref = {{cascite|changed|??}} | CASNo = 132864-75-6 | CASNoOther = | PubChem = 101670390 | ChemSpiderID = 68024617 | StdInChI=1S/C82H50O51/c83-13-1-8-20(46(93)41(13)88)21-9(2-14(84)42(89)47(21)94)76(117)128-67-18(6-124-73(8)114)126-74(115)10-3-15(85)43(90)48(95)22(10)26-36-28(54(101)62(109)52(26)99)29-38-33(59(106)65(112)55(29)102)34(69(130-79(38)120)71(67)132-80(36)121)32-35-25(51(98)64(111)58(32)105)24-12(5-17(87)45(92)50(24)97)77(118)129-68-19(7-125-78(35)119)127-75(116)11-4-16(86)44(91)49(96)23(11)27-37-30(56(103)63(110)53(27)100)31-39-40(60(107)66(113)57(31)104)61(108)70(131-82(39)123)72(68)133-81(37)122/h1-5,18-19,34,61,67-72,83-113H,6-7H2/t18-,19+,34+,61+,67-,68+,69-,70-,71+,72+/m0/s1 | StdInChIKey = QTCMAUFCWPWEDU-DMXGXNKNSA-N | SMILES = C1[C@H]2[C@@H]([C@@H]3[C@@H]4[C@@H](C5=C(C(=C(C(=C5C(=O)O4)C6=C(C(=C(C(=C6C(=O)O3)C7=C(C(=C(C=C7C(=O)O2)O)O)O)O)O)O)O)O)O)C8=C(C(=C(C9=C8C(=O)OC[C@@H]2[C@H]([C@@H]3[C@@H]4[C@@H](C5=C(C(=C(C(=C5C(=O)O4)C4=C(C(=C(C(=C4C(=O)O3)C3=C(C(=C(C=C3C(=O)O2)O)O)O)O)O)O)O)O)O)O)OC(=O)C2=CC(=C(C(=C29)O)O)O)O)O)O)OC(=O)C2=CC(=C(C(=C2C2=C(C(=C(C=C2C(=O)O1)O)O)O)O)O)O }} |Section2={{Chembox Properties | C=82 | H = 50 | O = 51 | Appearance = | Density = | MeltingPt = | BoilingPt = | Solubility = }} }} '''Roburin A''' is a tannin found in oak wood (''Quercus robur'' and ''Quercus petraea''<ref>{{cite journal |doi=10.1139/x98-066 |title=Variability of wood extractives among ''Quercus'' roburand ''Quercus'' petraeatrees from mixed stands and their relation to wood anatomy and leaf morphology |journal=Canadian Journal of Forest Research |volume=28 |issue=7 |pages=994–1006 |year=1998 |last1=Mosedale |first1=J R |last2=Feuillat |first2=F |last3=Baumes |first3=R |last4=Dupouey |first4=J-L |last5=Puech |first5=J-L |bibcode=1998CaJFR..28..994M }}</ref> or ''Quercus alba''<ref>{{cite journal |doi=10.1021/jf070151m |pmid=17444655 |title=Identification and Sensory Evaluation of Dehydro- and Deoxy-ellagitannins Formed upon Toasting of Oak Wood (''Quercus alba'' L.) |journal=Journal of Agricultural and Food Chemistry |volume=55 |issue=10 |pages=4109–18 |year=2007 |last1=Glabasnia |first1=Arne |last2=Hofmann |first2=Thomas |bibcode=2007JAFC...55.4109G }}</ref>) or oak cork (''Quercus suber''<ref>{{cite journal |doi=10.1021/jf9709360 |title=Changes in Tannic Composition of Reproduction Cork ''Quercus'' suberthroughout Industrial Processing|journal=Journal of Agricultural and Food Chemistry |volume=46 |issue=6 |pages=2332–6 |year=1998 |last1=Cadahía |first1=Estrella |last2=Conde |first2=Elvira |last3=Fernández De Simón |first3=Brígida |last4=García-Vallejo |first4=María Concepción |bibcode=1998JAFC...46.2332C }}</ref>).
It is a dimeric compound, composed of two vescalagin subunits probably linked through an ether bond between the diphenoyl group (hexahydroxydiphenic acid or HHDP) of one subunit and the triphenoyl moiety (nonahydroxytriphenic acid) of the other one.<ref>{{cite journal |doi=10.1016/0031-9422(91)84148-L |title=Roburin A, A dimeric ellagitannin from heartwood of Quercus robur |journal=Phytochemistry |volume=30 |pages=329–32 |year=1991 |last1=Herve du Penhoat |first1=Catherine L.M. |last2=Michon |first2=Veronique M.F. |last3=Ohassan |first3=Abdelhamid |last4=Peng |first4=Shuyun |last5=Scalbert |first5=Augustin |last6=Gage |first6=Douglas|issue=1 |bibcode=1991PChem..30..329H }}</ref>
== References == {{Reflist}}
{{Ellagitannin}}
Category:Ellagitannins Category:Tannin dimers
{{aromatic-stub}}