Patent ID: 8895769

Claim:
A compound represented by the following formula (I), or a salt thereof: wherein, in the formula, R 1 , R 2 , and R 3 independently represent an alkyl group, an alkenyl group, an alkynyl group, or an aryl group, any of which may have a substituent, and wherein two or three groups selected from R 1 , R 2 , and R 3 may bind together to form a ring; n represents 0 or 1; R 4 represents an unsubstituted amino group, a monoalkylamino group, or an acylamino group; and R 5 represents —(CY 2 ) p —COOR 6 wherein p represents an integer of 0 to 3, Y represents a hydrogen atom or deuterium atom, and R 6 represents a hydrogen atom or an alkyl group that may have a substituent.