| abstract |
A compound represented by the formula (I) [R 1 to R 3 represent an alkyl group, an alkenyl group, and the like; n represents 0 or 1; R 4 represents an amino group or - (CX 2 ) m -COOH (m represents 0 to 3, and X represents hydrogen atom); R 5 represents-(CY 2 ) p -COOR 6 (p represents an 0 to 3, Y represents hydrogen atom, and R 6 represents hydrogen atom or an alkyl group)], or a salt thereof. |