View of a pair of inversion related, major-component
reactant molecules of trans-2-butenoate
superimposed on the major product component, (3S,4R)-rel-1-hexene-3,4-dicarboxylate;
(b) the identical view with the reactant molecules
removed. Reactants have green C atoms and gray H atoms,
while product molecules have yellow C atoms and black H
atoms. Disorder of the product molecule is not shown,
and disorder of the O atoms was not resolved (view from
32-day gamma-ray irradiation; see
Cryst. Growth Des. 2021, 21, 663-682; DOI:
10.1021/acs.cgd.0c01466)