The monomer type found at this position in the sequence of
the entity or biological unit described in this data block.
This data item is a pointer to _chem_comp.id in the CHEM_COMP
category.
Additional Descriptive Information for Depositors
The monomer type found at this position in the
sequence of the entity or biological unit described
in this data block. This data item is a pointer
to _chem_comp.id in the CHEM_COMP category.