#$%^&*AU2013202514B220150917.pdf#####ABSTRACT A compound represented by the following general formula (11) or a salt thereof is used as an activator of SppAp3 (II) R As wherein Ga is 0, CH or the like; 10 A8 is thiazole, oxazole, or thiophene, which can have a substituent such as C alkyl, C4,8 alkoxy, halogen, C1. alkyl substituted with halogen or the like; B' is a C1 j alkylene or C2 alkenylene chain; and each of R and R" independently is hydrogen, C 15 alkyl, C>;B alkoxy, halogen, C7 8 alkyl substituted with halogen or the like