The unsaturated link occurs in a cyclic system. 在環(huán)體系中存在不飽和鍵。
Then a hexacyclic-ring system formed as a result of molecular recombination, based on which further dehydrogenation occurred. 然后經(jīng)過(guò)重排又轉變成了一個(gè)具有碳碳雙鍵的六員環(huán)體系，并在此基礎上進(jìn)一步發(fā)生脫氫反應。
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