| abstract |
A compound having the following formula (I): n n n wherein n R 1 is N-containing heterocyclic ring optionally substituted with one or more suitable substituent(s), n R 2 is hydroxyamino, n R 3 is hydrogen or a suitable substituent, n L 1 is —(CH 2 ) n — (wherein n is an integer of 0 to 6) optionally substituted with one or more suitable substituent(s), wherein one or more methylene(s) may be replaced with suitable heteroatom(s), and n L 2 is lower alkenylene, n or a salt thereof. The compound is useful as a histone deacetylase inhibitor. |