Chemical. CAS: 167698-68-2 (free base). Formula: C34H44N8O8 . C2HF3O2. MW: 692.8 . 114.0. Fluorogenic tetrapeptide substrate for ubiquitin C-terminal hydrolases (UCHs, e.g. UCHL3) and isopeptidase T. LRGG is the preferred substrate sequence of the human deSUMOylating enzymes SENP6 and SENP7. Excitation: 380nm. Emission: 460nm. - Fluorogenic tetrapeptide substrate for ubiquitin C-terminal hydrolases (UCHs, e.g. UCHL3) and isopeptidase T. LRGG is the preferred substrate sequence of the human deSUMOylating enzymes SENP6 and SENP7 [3]. Excitation: 380nm. Emission: 460nm.