justicidin A

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| ImageFile = Justicidin A.svg

| ImageSize = 150px

| PIN = 9-(2H-1,3-Benzodioxol-5-yl)-4,6,7-trimethoxynaptho[2,3-c]furan-1(3H)-one

| OtherNames = Diphyllin methyl ether

| Section1 = {{Chembox Identifiers

| CASNo = 25001-57-4

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

| ChEBI = 6093

| ChEMBL = 508532

| ChemSpiderID = 140644

| KEGG = C10633

| PubChem = 159982

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

| UNII = Q58EXN1G4M

| StdInChI=1S/C22H18O7/c1-24-16-7-12-13(8-17(16)25-2)21(26-3)14-9-27-22(23)20(14)19(12)11-4-5-15-18(6-11)29-10-28-15/h4-8H,9-10H2,1-3H3

| StdInChIKey = ANFSXHKDCKWWDB-UHFFFAOYSA-N

| SMILES = COC1=C(C=C2C(=C1)C(=C3C(=C2OC)COC3=O)C4=CC5=C(C=C4)OCO5)OC

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| Section2 = {{Chembox Properties

| C=22|H=18|O=7

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| Section3 = {{Chembox Hazards

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Justicidin A is an organic compound isolated from Justicia procumbens. It is classified as a lignan.{{cite journal |doi=10.1023/B:PHYT.0000045487.02836.32|title=Diversity in lignan biosynthesis|year=2003|last1=Umezawa|first1=Toshiaki|journal=Phytochemistry Reviews|volume=2|issue=3|pages=371–390|bibcode=2003PChRv...2..371U |s2cid=6276953}}{{cite journal |last1=Xiong |first1=Lu |last2=Bi |first2=Ming-Gang |last3=Wu |first3=Song |last4=Tong |first4=Yuan-Feng |year=2012 |title=Total synthesis of 6′-hydroxyjusticidin A |journal=Journal of Asian Natural Products Research |volume=14 |issue=4 |pages=322–6 |pmid=22375869 |doi=10.1080/10286020.2011.653561|s2cid=26689006 }} The compound may possess cytotoxic effects.{{cite journal |last1=Fukamiya |first1=Narihiko |last2=Lee |first2=Kuo-Hsiung |year=1986 |title=Antitumor Agents, 81. Justicidin-A and Diphyllin, Two Cytotoxic Principles from Justicia procumbens |journal=Journal of Natural Products |volume=49 |issue=2 |pages=348–50 |pmid=3734816 |doi=10.1021/np50044a030}}