Four a-galactosyl phytosphingosine 2,6’-diamide analogs
were prepared from 2,6’-diamino a-galactosylphytosphingosine
and the aromatic-bearing carboxylic acids. After purification with High
Performance Liquid Chromatography, a flowcytometry for the four compounds for
stimulation of human Va24+/Vb11+ NKT cell populations was carried out. Additional keto groups on the acyl
chains of the 2,6’-diamide compound was associated with the enhanced stimulating effect.