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CYANA can obtain the bonding topology from a .mol2 molecular structure file, converting it into its own (library)
format, a .lib file. This library file with contain information about one molecule, but since biopolymers - proteins
contain chain (sequence) of building blocks like aminoacid residues of nucleotides, there has to be also information
about the sequence of those building block. In our case it contains only one record: the name of our ligand molecule.
We will use a ready mol.lib file in our exercise. Besides of the physical atoms H, there are also pseudoatoms Q created to replace the chemically equivalent H atoms.
We complete the information by a .seq file with a "sequence" containing only one line the name and number of the residue (MOL 999)
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