Figure 2

Crystal structure of compound 2. Some bond lengths (Å) and angles (°): N(1)-C(7) 1.336(2), N(2)-C(7) 1.328(8), N(3)-C(31) 1.329(5), N(4)-C(31) 1.326(8); N(1)-C(7)-N(2) 110.3(2), N(3)-C(31)-N(4) 111.0(2).

Crystal structure of compound 2. Some bond lengths (Å) and angles (°): N(1)-C(7) 1.336(2), N(2)-C(7) 1.328(8), N(3)-C(31) 1.329(5), N(4)-C(31) 1.326(8); N(1)-C(7)-N(2) 110.3(2), N(3)-C(31)-N(4) 111.0(2).