Phorbol 12 myristate 13 acetate

4-(Dimethylamino)phenylboronic acid and phorbol 12-myristate 13-acetate (PMA) were purchased from Macklin (Shanghai, China). 5-Bromothiophene-2-carbaldehyde and 4-bromomethylphenylboronic acid pinacol ester were obtained from energy-chemical (Shanghai, China). 3-Pyridineacetonitrile was bought from Bidepharmatech (Shanghai, China). H₂O₂ (30%) and N-acetyl-cysteine (NAC) were purchased from Aladdin (Shanghai, China). All other chemicals were used directly without further purification. All reactions were continuously stirred and monitored by thin layer chromatography (TLC). ¹H and ¹³C NMR spectra were taken on a JEOL 400 spectrometer. Mass spectra (MS) were measured on an America Agilent 1290/6550 mass spectrometer. Fluorescence spectra were recorded on an Agilent F-4600 fluorescence spectrophotometer. The fluorescent images were taken on a Leica STELLARIS 5 confocal laser scanning microscopy (CLSM).