The molecule is the conjugate base of ketomycolic acid type-3 (XIII''). A class of mycolic acids characterized by the presence of a proximal cis-cyclopropyl group followed by a cis C=C double bond and a distal oxo group in the meromycolic chain.
(2R,3R)-2-ethyl-3-hydroxy-4-[2-[(Z,6S)-6-methyl-5-oxooct-2-enyl]cyclopropyl]butanoate