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Key indicators Single-crystal X-ray study T = 294 K Mean '(C±C) = 0.002 A Ê R factor = 0.045 wR factor = 0.136 Data-to-parameter ratio = 19.3 For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e. # 2001 International Union of Crystallography Printed in Great Britain ± all rights reserved The title compound, C 22 H 16 O 4 , is composed of six rings bridged via two chiral C atoms. A couple of enantiomers cocrystallize to give adoi:10.1107/s1600536801007772 fatcat:bsm4gdcfhnaknolev7pywsa6je