Table 3. Bond lengths (Å) and angles (°) for HEA-pABA.

N(1)-C(1)	1.481(3)
O(1)-C(2)	1.409(3)
C(1)-C(2)	1.495(4)
N(2)-C(6)	1.404(3)
O(2)-C(9)	1.257(3)
O(3)-C(9)	1.281(3)
C(3)-C(4)	1.384(3)
C(3)-C(8)	1.391(3)
C(3)-C(9)	1.492(3)
C(4)-C(5)	1.377(3)
C(5)-C(6)	1.387(4)
C(6)-C(7)	1.389(4)
C(7)-C(8)	1.379(3)
N(1)-C(1)-C(2)	112.1(3)
O(1)-C(2)-C(1)	113.9(3)
C(4)-C(3)-C(8)	117.8(2)
C(4)-C(3)-C(9)	121.8(2)
C(8)-C(3)-C(9)	120.3(3)
C(5)-C(4)-C(3)	121.4(3)
C(4)-C(5)-C(6)	120.7(3)
C(5)-C(6)-C(7)	118.3(2)
C(5)-C(6)-N(2)	121.5(3)
C(7)-C(6)-N(2)	120.1(3)
C(8)-C(7)-C(6)	120.7(3)
C(7)-C(8)-C(3)	121.1(3)
O(2)-C(9)-O(3)	122.9(3)
O(2)-C(9)-C(3)	118.6(3)
O(3)-C(9)-C(3)	118.5(3)