FIG. 2.

Mass spectra of dimethyl esters of 3-MeBS. (A) dl-3-MeBS standard. (B) 3-MeBS-d₆ produced from m-xylene-d₆ and fumarate by permeabilized cells of Azoarcus sp. strain T (Table 1). Although the exact location of the D atom abstracted from the m-xylene methyl carbon and retained in the succinyl moiety of 3-MeBS-d₆ has not yet been determined, the D atom is depicted in Fig. 2B for illustrative purposes.