Mori, K., and H. Iwasawa. 1980a. Preparation of both enantiomers of threo-2-amino-3-methylhexanoic acid by enzymatic resolution and their conversion to optically active forms of threo-4-methylheptan-3-ol, a pheromone component of the smaller European elm bark beetle . Tetrahedron 36:2209-2213.