2,4-Ethanobiscyclopropa(4,5)cyclopenta(1,2,3-cd:1',2',3'gh)pentalene-5,6-dione, tetradecahydro-, (1aalpha,1bbeta,2alpha,2abeta,2balpha,3aalpha,3bbeta,3cbeta,3dbeta,4alpha,4abeta,4b. 68217-20-9