Chemical constituents of gallotannin and other galloyl-containing molecules tested as poly(ADP-ribose) glycohydrolase (PARG) inhibitors. (a) Representative HPLC/DAD chromatographic profile of gallotannin, reported at 280 nm. The presence and % of the different galloyl derivatives are shown. a–g represent the esa-, epta-, octa-, ena-, deca-, endeca-, dodeca- and galloyl glucose derivatives, respectively. (b) Structures of galloyl derivatives tested as PARG inhibitors.