Crystal structures of 3,6-diallyltetracyclo[6.3.0.0<sup>4,11</sup>.0<sup>5,9</sup>]undeca-2,7-dione and 1,7-diallylpentacyclo[5.4.0.0<sup>2,6</sup>. 0<sup>3,10</sup>.0<sup>5,9</sup>]undecane-8,11-dione: allylated caged compounds
Acta crystallographica. Section E