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Matsukawa
Yakugaku Zasshi, 1942 , vol. 62, p. 417,443;dtsch.Ref.S.122,125
Chem.Abstr., 1951 , p. 4724
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Hoffmann-La Roche
Patent: US2271503 , 1940 ;
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Hoffmann-La Roche
Patent: DE731562 , 1940 ;
DRP/DRBP Org.Chem.