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Patent: US2332906 , 1940 ;

Das-Gupta; Gupta
Journal of the Indian Chemical Society, 1946 , vol. 23, p. 13
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Leitch; Baker; Brickman
Canadian Journal of Research, Section B: Chemical Sciences, 1945 , vol. 23, p. 139,147

Leitch; Baker; Brickman
Canadian Journal of Research, Section B: Chemical Sciences, 1945 , vol. 23, p. 139,147
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Chinoin
Patent: CH215400 , 1940 ;

Cilag
Patent: CH230069 , 1942 ;

Bergmann
Journal of the American Chemical Society, 1946 , vol. 68, p. 761,764