| abstract |
(57) [Problem] To provide a low-toxic low-molecular compound having a nerve cell differentiation promoting action. SOLUTION: The general formula [1] Wherein A represents an unsubstituted or substituted aliphatic hydrocarbon group having 1 to 4 carbon atoms, and B represents an unsubstituted or substituted carbon Represents an aliphatic hydrocarbon group of 4 to 4, or represents that A and B are bonded together to form a cycloalkane-1-one ring having 3 to 7 carbon atoms (excluding the case of 5 carbon atoms), X represents O, S, SO, SO2 or NH; Y represents a substituted or unsubstituted aliphatic hydrocarbon group having 1 to 6 carbon atoms; Z represents a carboxy group or the like. Or a pharmacologically acceptable salt thereof. |