The structure of galbanic acid

Synthesis, biosynthesis and biological activities of galbanic acid – A review

“…In 1955, Pigulevskii et al ascribed the structure 1a for GA (Bagirov et al, 1980;Pigulevskii & Naugol'naya, 1955) (Figure 2). In 1973, Borisov et al (1975) revised the structure of GA as 1b on the basis of 1 H-NMR and mass spectra. Later, Bagirov et al (1980) proposed a different structure (1c) for GA, as shown in Figure 2.…”

“…The problem was that GA does not have a crystalline form, which provides a condition for an X-ray crystallographic analysis. However, researchers resolved this problem by X-ray crystallographic analysis of GA precursors (Bagirov et al, 1980;Borisov et al, 1975;Corbu et al, 2008;Lee et al, 1998).…”