The experimental section of a manuscript if the manuscript is
submitted in parts. As an alternative see _publ.manuscript_text
and _publ.manuscript_processed.
The _publ.section_exptl_prep, _publ.section_exptl_solution and
_publ.section_exptl_refinement items are preferred for
separating the chemical preparation, structure solution and
refinement aspects of the description of the experiment.