Fused substituted aminopyrrolidine derivative

A compound of formula (I), or a salt thereof:

• wherein
• R1 is a hydrogen atom;
• R2 is a hydrogen atom;
• R3 and R4 are hydrogen atoms;
• R5 is a hydrogen atom or a fluorine atom;
• R6 and R7 taken together with the carbon atoms to which they are bonded form a five- to six-membered cyclic structure, the cyclic structure representing a partial structure that together with the pyrrolidine ring forms a fused cyclic structure, wherein the five- to six-membered cyclic structure does not contain a double bond and optionally contains an oxygen atom as a ring constituent atom,
• R5 is optionally a methylene group taken together with R6 to form a three-membered fused cyclic structure;
• and
• Q is a partial structure represented by formula (II):
• wherein
• R8 is a 1,2-cis-2-halogenocyclopropyl group, a cyclopropyl group, or a 6-amino-3,5-difluorophenyl group;
• R9 is a hydrogen atom;
• R10 is a hydrogen atom;
• R11 is a hydrogen atom or an amino group;
• X1 is a fluorine atom or a hydrogen atom;
• A1 is a partial structure represented by formula (III):
• wherein X2 is a methyl group or a methoxy group,
• or X2 and R8 taken together with the atoms of formula (II) through which they are connected form a cyclic structure such that Q represents a partial structure represented by the following formula:
• wherein Y0 is a methyl group or a fluoromethyl group, and X1, R9, R10 and R11 are defined as above.