Figure 2: Structures of mycolic acids from M. tuberculosis (Julien Vaubourgeix et al., 2009 and Glickman et al., 2002). Alpha Mycolates contain cyclopropane rings at both the distal and the proximal positions. Methoxymycolates and ketomycolates have cis or trans cyclopropane rings at the proximal position and the oxygenated functional group at the distal position.