The synthesis of 20-azido(tri-n-butyltin)benzoate of 20-hydroxy-(8S)-h
epoxilin A(3) (HxA(3)(double dagger)) methyl ester, a tool for the lab
elling of proteins involved in hepoxilin metabolism, has been performe
d starting from a synthetic precursor of 20-hydroxy hepoxilins.