RON- C+N recep-1RON- C+N recep-2RON- C+N recep-3RON- C+N recep-4RON- C+N recep-5RON- C+N recep-6RON- C+N recep-7RON- C+N recep-8RON- C+N recep-9RON- C+N recep-10RON- C+N recep-11RON- C+N recep-12RON- C+N recep-13RON- C+N recep-14RON- C+N recep-15RON- C+N recep-16RON- C+N recep-17RON- C+N recep-18RON- C+N recep-19RON- C+N recep-20