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Acta Crystallographica Section D Acta Crystallographica Section D BIOLOGICAL CRYSTALLOGRAPHY |
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![[Figure 3]](https://journals.iucr.org/ba5073fig3mag.jpg)
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| Figure 3 Example of a modification. This example describes methylation at the O1 position of pyranoses. See Fig. 2 ![[link]](https://journals.iucr.org/logos/arrows/d_arr.gif) (a) for a graphical representation of this modification. The first (general) category
(_chem_mod) reports the code for the modification `O1MET' and describes whether the modification
is to be applied to only a particular monomer or to a group of monomers. The `O1MET'
modification can be applied to all monomers belonging to the `pyranose' group. The
(_chem_mod_atom) category describes the list of all added, deleted or changed atoms. The following
category (_chem_mod_bond) describes all added or deleted bonds. In a similar manner, the tree structure (_chem_mod_tree), bond angles (_chem_mod_angle), torsion angles (_chem_mod_tor), planes (_chem_mod_plane_atom) and chiralities (_chem_mod_chir) affected by the modification are handled. |
![[Figure 3]](https://journals.iucr.org/10.1107/S0907444904023510/ba5073fig3.jpg)
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BIOLOGICAL CRYSTALLOGRAPHY |
ISSN: 1399-0047
