... CH2Cl2 Impurity annihilation; a strategy for solution phase combinatorial chemistry with minimal purification Anthony GM Barrett,*† Marie L. Smith* and Frederic J. Zecri Department of Chemistry, Imperial College of Science, Technology and Medicine, London, UK SW7 2AY ... 4). 1 MA Gallop, RW Barrett, WJ Dower, SPA Fodor and EM Gordon, J. Med. Chem., 1994, 37, 1233; EM Gordon, RW Barrett, WJ Dower, SPA Fodor and MA Gallop, J. Med. ...