... (1) .B. A. Otter and JF Fox, "Synthetic Procedures in Nucleic Acid Chemistry", WW Zorbach ... SOC., 94, 6190 (21) KK Ogiivie and D. J. Iwacha, Tetrahedron Lett., 317 (1973). ... washed with 5% sodium bicarbonate and then water, and after evaporation the crude organic extract was ...