Letter from Charles Dodds, Courtauld Institute of Biochemistry, Middlesex Hospital, London to Howard Walter Florey Says Beechams are concerned about their patent position in relation to 6-aminopenicillanic acid - comments on this - discusses opposition by ICI and Distillers, quoting work of Sakaguchi and Murac in 1950 - would help Beechams case if independent person could say he had failed to confirm this work - surprised these two companies should try to weaken at British patent - would like Florey's opinion. 13 April 1962