甲乙哌酮 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "甲乙哌酮" in Chinese language version.

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800^th place

1,214^th place

espacenet.com

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US granted 2680116,Frick H, Lutz AH,「Piperidiones and Process for the Manufacture thereof」,发行于1954-06-01,指定于Hoffmann-La Roche