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公开(公告)号：US2846475A
公开(公告)日：1958-08-05
申请号：US59758556
申请日：1956-07-13
Applicant: HOFFMANN LA ROCHE
Inventor： OTTO ISLER , MARE MONTAVON , RUDOLF RUEGG , PAUL ZELLER
CPC classification number: C07C2601/16
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