D-H H...A D...A D-H...A
C22-H22...Cl2i 0.93 2.66 3.570 (7) 168
C28-H28C...Cl1ii 0.96 2.81 3.769 (12) 173
Table 2: Hydrogen-bond parameters for 2a (Å, °). Symmetry codes: (i) x, 1/2-y, -1/2+z; (ii) 1-x, 1-y, 2-z.