V. Pattabhi, S. Banumathi, G. Mehta
Apr 15, 1994
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Journal
Acta Crystallographica Section C-crystal Structure Communications
Abstract
The crystal structures of endo,anti,syn-heptacyclo[10.6.1.1 5,8 .1 14,17 .0 2,11 .0 13,16 ]henicosa-4(9),6,13(18),15-tetraene-3,10-dione, C 21 H 18 O 2 , (1), and exo,syn,syn-hexacyclo[10.4.2.1 5.8 .0 2,11 .0 4,9 .0 13,16 ]nonadeca-4(9),6,14,17-tetraene-3,10-dione, C 19 H 16 O 2 , (II), are reported. The packing of the molecules in both structures is stabilized by van der Waal's forces