The pigments of stick lac. Part II. The structure of laccaic acid A

Authors:
  • RBR. Burwood
    R. Burwood
  • GRG. Read
    G. Read
  • KSK. Schofield
    K. Schofield
  • DWD. E. Wright
    D. E. Wright
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Abstract
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.