Xp. Fang et al., STRUCTURAL REVISIONS OF SOME NON-ADJACENT BIS-TETRAHYDROFURAN ANNONACEOUS ACETOGENINS, Journal of natural products, 56(7), 1993, pp. 1095-1100
The relative stereochemistries of bullatalicin 1! and bullatalicinone
2! were partially reassigned based on COSY and relayed COSY spectra.
The structures of annonins VIII 3!, IV 4!, and XVI 5! were revised
and concluded as bullatalicin 1!, bullatanocin 6!, and squamostatin
A 7!, respectively.