o and nicotinoylamino), an alkoxycarbonylamino group (preferably having from 2 to 20 carbon atoms, more preferably having from 2 to 16 carbon atoms, and particularly preferably having from 2 to 12 carbon atoms, such as methoxycarbonylamino), an aryloxycarbonylamino group (preferably having from 7 to 20 carbon atoms, more preferably having from 7 to 16 carbon atoms, and particularly preferably havi