Parpi is a research compound designed as a PARP (poly-ADP-ribose polymerase) inhibitor. The compound targets the PARP enzyme family involved in DNA damage repair pathways, particularly single-strand break repair via base excision repair. Parpi inhibits PARP activity by competing with NAD+ at the catalytic site, leading to the accumulation of DNA damage in cells. In research contexts, Parpi is used for studying DNA repair mechanisms, synthetic lethality interactions with BRCA mutations, and cellular responses to genotoxic stress. Parpi serves as a tool for investigating the role of PARP in genome maintenance.