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Bis-2-(5-phenylacetamido-1,3,4-thiadiazol-2-yl)ethyl sulfide (BPTES) is a selective inhibitor of glutaminase-1 (GLS1), consequently inhibiting glutaminolysis. BPTES is known for its potent antitumor activity and plays a significant role in senescent cell removal. In this study, we synthesized [ 11 C-carbonyl]BPTES ([ 11 C]BPTES) as a positron emission tomography (PET) probe for the first time and assessed its biodistribution in mice using PET. [ 11 C]BPTES was synthesized by the reaction of an amine precursor () with [ 11 C-carbonyl]phenylacetyl acid anhydride ([ 11 C] 2 ), which was prepared from [ 11 C]CO 2 and benzyl magnesium chloride, followed by in situ treatment with isobutyl chloroformate. The decay-corrected isolated radiochemical yield of [ 11 C]BPTES was 9.5% (based on [ 11 C]CO 2 ) during a synthesis time of 40 min. A PET study with [ 11 C]BPTES showed high uptake levels of radioactivity in the liver, kidney, and small intestine of mice.

The Glutaminase-1 Inhibitor [11C-carbony]BPTES: Synthesis and Positron Emission Tomography Study in Mice