Figure 2
From: A Comparison of the Antibacterial and Antifungal Activities of Thiosulfinate Analogues of Allicin

Reaction mechanism of a thiol with a thiosulfinate. The reaction leads directly (a), and indirectly (b), to the formation of a mixed disulfide, which under some conditions may react further with RSH in a thiol disulfide exchange reaction to form RSSR and R1SH.