TFMU-ADPr serves as a versatile substrate for assessing poly(ADP-ribose) glycohydrolase (PARG) activity, enabling direct measurement of total PAR hydrolase activity through the liberation of a fluorophore. Exhibiting exceptional reactivity, generality, stability, and usability, TFMU-ADPr is an effective tool for evaluating small-molecule inhibitors and investigating the regulation of ADP-ribosyl catabolic enzymes in vitro [1].