1. Open the database

2. Simplify the crystal structure to its underlying net in standard representation using the method

3. Turn to the initial

Pay attention that the molecules form dimers with pairs of molecules connected by H-bonds.

4. Get a simplified net were the nodes are the centroids of the dimers (synthon simplification, see e.g. Baburin, I. A.; Blatov, V. A.; Carlucci, L.; Ciani, G.; Proserpio, D. M. Cryst. Growth Des.; 2008; 8; 519-539). For this purpose we will change the type of the hydrogen bonds N2…H2 (in valence, specific or Wan der Waals bond type) to distinguish it from other hydrogen bonds. Duplicate the entry so you can make any changes and save the original structure: right-click and choose

Save the changes and simplify the structure again using the

5. We can obtain the net of dimers starting from the simplified net in the standard representation. We need to find the "dimers", here represented by the shortest connection. Also the other two long connections are related by symmetry, so the set of "bonds" is divided in 1+2. The single independent "bond" must be the dimer. Now we can do a simplification, changing the two equivalent bonds into H-bonds, making the "dimer" isolated, hence the standard representation can be done. Turn to the

Save the changes and simplify the net (Choose Whole Molecule while simplification procedure). The resulting net is a