compounds composed solely of an even number of carbon atoms, which form a cage-like fused-ring polycyclic system with twelve five-membered rings and the rest six-membered rings, Paarisarvulise süsiniku aatomite sisaldusega molekulid, mis ei sisalda teisi aatomeid ja moodustavad puuritaolise polütsüklilise pinnaga süsteeme.
