(2R,4R)-2-(1,1-Dimethylethyl)-4-methyl-4-[(1E)-2-methyl-1,3-butadien-1-yl]-1,3-oxathiolan-5-one is a by-product intermediate in synthesizing (R)-(+)-Thiolactomycin (T350880). It is a natural product inhibitor of β-Ketoacyl-AcpM Synthase A (KasA). It inhibits the synthesis of mycolic acid which is a major cell wall component of Mycobacterium tuberculosis. Also an inhibitor of D-Aspartate oxidase (DDO).