anti-8,20-dimethyl-1-exo-methylenebenzo(9,10-a)<2.2>metacyclophane

trans-4,12c,12d-trimethyl-12c,12d-dihydrobenzopyrene

10-(ethylsulfonyl)-17,18-dimethyl-10,11-dihydro-5,9:12,16-di(metheno)benzo[14]annulene

10,17,18-trimethyl-10-(phenylsulfonyl)-10,11-dihydro-5,9:12,16-di(metheno)benzo[14]annulene