▎ 摘　　要

An opposite edge strip ops with respect to a given edge of a graph is the smallest subset of edges closed under taking opposite edges on faces. The Omega polynomial is a counting polynomial whose k-th coefficient is the number m(G, k) of ops containing k-edges. In this paper an exact formula for the Omega polynomial of the molecular graph of a new type of graphene named CorCor is given. As a consequence, the PI index of this nanostructure is computed.