Physical and chemical methods have been used to show that laccaic acid A1, the major pigment of stick lac, is 3-[3-(2-acetamidoethyl)-6-hydroxyphenyl]-1,2,4,7-tetrahydroxyanthraquinone-5,6-dicarboxylic acid.
R. Burwood, G. Read, K. Schofield and D. E. Wright, J. Chem. Soc. C, 1967, 842 DOI: 10.1039/J39670000842
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