Nicolaou; Pihko, Petri M.; Diedrichs, Nicole; Zou, Ning; Bernal, Federico Angewandte Chemie - International Edition, 2001, vol. 40, # 7 p. 1262 - 1265 doi: 10.1002/1521-3773(20010401)40:7<1262::AID-ANIE1262>3.0.CO;2-9