IR-820 (Sigma Aldrich, Waltham, MA, USA, CAS 172616-80-7) (252 mg; 0.2967 mmol) and p-mercapto-benzoic acid (283 mg; 1.8381 mmol) were reacted in 15 mL of dimethylformamide by following our own methodology [7 (link)], and the title compound was obtained in good yield (99.7 mg).
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