参考文献
Lott; Smith; Christiansen
Journal of the American Pharmaceutical Association (1912-1977), vol. 26, p. 203
Chem. Zentralbl., 1937 , vol. 108, # II p. 3153
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Squibb and Sons
Patent: US2146752 , 1936 ;
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Squibb and Sons
Patent: US2013662 , 1934 ;
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Squibb and Sons
Patent: US2136387 , 1936 ;