the alkynyl group include: a propargyl group and a 3-pentynyl group); an aryl group (preferably having 6 to 30 carbon atoms, more preferably having 6 to 20 carbon atoms and specifically preferably having 6 to 12 carbon atoms, and examples of the aryl group include: a phenyl group, a p-methylphenyl group and a naphthyl group); a substituted or unsubstituted amino group (preferably having 0 to 20 c