TY - JOUR AU - Droz, A S; Neidlein, U; Anderson, S; Seiler, P; Diederich, F JO - Helv. Chim. Acta VL - 84 PY - 2001 DO - 10.1002/1522-2675(20010815)84:8<2243::AID-HLCA2243>3.0.CO;2-G SP - 2243 ER -