Abstract
The title dilactone exists in a crystalline state (110 K) as enantiomeric synchro-(+,+)-(R,R)- and synchro-(–,–)-(S,S)-twist forms (τ0 = |1.8°|) with the retention of C2 symmetry, linked by infinite zig-zag heterochiral chains (space group C2/c) by mutual H-bonds of the CH2–H‥O=C type.
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