Abstract
Denote by the set of h-polygonal chains (where h is even) with n congruent regular h-polygons (). For any let be the Wiener number of In this paper, we show that with the equalities on the left holding only if and the equalities on the right holding only if where and are extremal chains of type one and type two (their definitions are given in the main text), respectively. Thus we extend the known results of extremal benzenoid chains on Wiener number to a more general case.
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