General Intelligence · Seating Arrangement

Eight persons L, M, N, O, P, Q, R, and S are sitting around a square table facing the centre. Some of them are sitting at the corners while some are sitting exactly in the middle of the sides. P is sitting fourth to the left of Q. Only O is sitting between M and Q. N is sitting to the immediate right of L. R is sitting to the immediate left of M. L and P are sitting at the corners. Who is sitting fourth to the left of R?