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 C=C double bond and a distal oxo group and a (CH-CH3) fragment of (S) stereochemistry in the meromycolic chain.
(Z,2R,3R,9S)-2-ethyl-3-hydroxy-9-methyl-8-oxoundec-5-enoate