CCC(C)[C@H]1C(=O)N2CCCC[C@@H]2C(=O)N[C@H](C(=O)N[C@@H](C(=O)N1)C(=O)Cc3ccccc3)CCCCCC(=O)CC 18134 Ki = 500 nM 100296 5 P56519 Histone deacetylase 2