3,4-Dimethoxycinnamic acid

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| ImageFile = 3,4-Dimethoxycinnamic acid.svg

| ImageSize = 200px

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| PIN = (2E)-3-(3,4-Dimethoxyphenyl)prop-2-enoic acid

| OtherNames = 3-(3,4-Dimethoxyphenyl)propenoic acid; Caffeic acid dimethyl ether; Dimethyl caffeic acid; Dimethylcaffeic acid

|Section1={{Chembox Identifiers

| CASNo_Ref = {{cascite|correct|CAS}}

| CASNo = 14737-89-4

| CASNo1_Ref = {{cascite|correct|CAS}}

| CASNo1 = 2316-26-9

| CASNo1_Comment = (nonspecific)

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = BVZ841PVJL

| PubChem = 717531

| SMILES = COC1=C(C=C(C=C1)/C=C/C(=O)O)OC

| ChemSpiderID = 626174

| InChI = 1/C11H12O4/c1-14-9-5-3-8(4-6-11(12)13)7-10(9)15-2/h3-7H,1-2H3,(H,12,13)/b6-4+

| InChIKey = HJBWJAPEBGSQPR-GQCTYLIABS

| StdInChI = 1S/C11H12O4/c1-14-9-5-3-8(4-6-11(12)13)7-10(9)15-2/h3-7H,1-2H3,(H,12,13)/b6-4+

| StdInChIKey = HJBWJAPEBGSQPR-GQCTYLIASA-N}}

|Section2={{Chembox Properties

| C=11 | H=12 | O=4

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|Section3={{Chembox Hazards

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3,4-Dimethoxycinnamic acid is a cinnamic acid derivative isolated from coffee beans.{{cite journal|doi=10.1016/S0308-8146(97)00067-8|title=3,4-Dimethoxycinnamic acid levels as a tool for differentiation of Coffea canephora var. Robusta and Coffea arabica|year=1998|last1=Andrade|first1=P.B|last2=Leitão|first2=R|last3=Seabra|first3=R.M|last4=Oliveira|first4=M.B|last5=Ferreira|first5=M.A|journal=Food Chemistry|volume=61|issue=4|pages=511}}