| abstract |
There is provided a morpholine derivative represented by General Formula [1A] or a salt thereof. n n n n n n n n n n (In the formula, a ring A represents a ring represented by General Formula [I]; * represents a bonding position; Z 2 represents CH or the like; Z 1 represents CR 6 or the like; R 6 represents a hydrogen atom or the like; X 1 represents CHR 7 or the like; R 7 represents a hydrogen atom or the like; X 2 represents CH 2 or the like; R 1 and R 2 are the same as or different from each other, and each of R 1 and R 2 represents a hydrogen atom or the like; R 3 , R 4 , and R 5 are the same as or different from each other, and each of R 3 , R 4 , and R 5 represents a hydrogen atom, NR a R b , or the like; and each of R a and R b represents a hydrogen atom, a C 1-8 alkyl group which may have a substituent, or the like.) |