Confirmation of the Connectivity of 4,8,12,16,20-Pentamethylpentacosylphoshoryl β-d-Mannopyranoside, an Unusual β-Mannosyl Phosphoisoprenoid from Mycobacterium avium, through Synthesis

The synthesis of the title glycolipid is reported. Comparison of the electrospray and high-energy collision-induced dissociation mass spectra of the synthetic material with those reported for the isolate confirm the structure of this unusual antigenic substance with its modified isoprenoid chain.