D -symmetric chiral hydrogen-bonded cyclotetramers (see the structure in the picture) are present in the self-assembled achiral title compound in the solid state. The unilayered network set up from the chiral "square" blocks is achiral as a consequence of the crystal symmetry.

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http://dx.doi.org/10.1002/(SICI)1521-3773(19990201)38:3<381::AID-ANIE381>3.0.CO;2-PDOI Listing

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