Total synthesis of rapamycin. by Ley, S, Tackett, M, Maddess, M, Anderson, J, Brennan, P, Cappi, M, Heer, J, Helgen, C, Kori, M, Kouklovsky, C, Marsden, S, Norman, J, Osborn, D, Palomero, M, Pavey, J, Pinel, C, Robinson, L, Schnaubelt, J, Scott, J, Spilling, C, Watanabe, H, Wesson, K, Willis, M