Substituted dihydropyrrolopyrazole derivative

The present invention provides a compound represented by general formula (Ia) or a pharmacologically acceptable salt thereof. In general formula (Ia), the two R each independently represent a C 1-3 alkyl group or the like, and R 1 , R 2 , and R 3 each independently represent an optionally substituted linear or branched C 1-4 alkyl group.