We consider the product of general quasi-differential expressions τ1, τ2,..., τn each of order n with complex coefficients and their formal adjoints on the interval (a, b). It is shown in direct sum spaces L2 w (Ip), p= 1,..., N of functions defined on each of the separate intervals with the case of one singular end-points and when all solutions of the equation [Πn j= 1τj− λw] u= 0 and its adjoint [Πn j= 1τ+ j− λ w] v= 0 are in L2 w (a, b)(the limit circle case) that all well-posed extensions of the minimal operator T0 (τ1, τ2,..., τn) have resolvents ...