Tetrahedron Letters,Vol.29,No.44,pp 5625-5628,1988 Printed in Great Britain ... Munchen, Karlstrasse 29, D-8000 Munchen 2, West Germany ... in the presence of 200 mM tricine buffer pH 7.5, 200 uM NADPH and 5 uM C6-3H1-protopine (1) (60 000 dpm), in a total volume of 250 ul ...