The molecular structure has to be well defined.
Execution of the patch statement destroys fragile atom selections
(Section 2.15); e.g., the
atom properties (Section 2.16) are conserved
during patching, except for the internal stores (STORE1, STORE2, ...).
The atom properties of additional atoms are set
to default values. Other information, such as information for the
xrefin or
NOE statements, is lost during patching.