Estimate on the second Hankel functional for a subclass of close-to-convex functions with respect to symmetric points

Let $S$ be the class of functions which are analytic, normalised and univalent in the open unit disc $D={{z:lvert {z}rvert<1}}$. In cite{jTA06}, Janteng introduced a subclass of close-to-convex functions with respect to (w.r.t) symmetric points denoted by $K_s(alpha)$, $0leq alpha<1$. In this paper, we give the upper bound for the second Hankel determinant for this particular class of functions.