| abstract |
A compound represented by the general formula (I), a salt thereof, or a hydrate thereof: (I) wherein X1, X2, X3, and X4 each independently means a single bond, or C1-6 alkylene, etc.; A2 means optionally substituted phenyl, etc.; A1 means an optionally substituted group represented by -C(=Q1)- [wherein Q1 means oxygen, sulfur, or a group represented by =N-R11 (wherein R11 means hydrogen or C1-6 alkyl)], and a 5- to 7-membered nitrogenous heterocyclic group, etc.; and Z1 means piperidin-2-yl, etc. |