Systematic screening of the activities of the eleven human zinc-dependent lysine deacylases against a series of fluorogenic substrates (see scheme) as well as kinetic evaluation revealed substrates for screenings of histone deacetylases HDAC10 and HDAC11 at reasonably low enzyme concentrations. Furthermore, HDAC3 in complex with nuclear receptor corepressor 1 (HDAC3–NCoR1) was shown to harbor decrotonylase activity in vitro.