Fig. 6: GST prodrugs.

a Bioconversion of canfosfamide in an active alkilating metabolite played by GSTP1-1; b synthesis and bioconversion played by GST of a metformin sulfonamide prodrug; c GSH conjugation with nitric oxide releasing agents to form diazeniumdiolate anion and subsequent release of two NO molecules; d Release of active doxorubicin by GST sulfomidase activity played on nitrobenzenesulfonyl analogues