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| 5756722 | Intermediates for the preparation of .DELTA..sup.4,9(11),17(20) -pregnatriene-3-ones | Sep 06, 96 | May 26, 98 | AVENTIS PHARMA S.A. |
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| 5399685 | Process for the preparation of 20-keto-21 alpha-01-steroids | Jun 11, 93 | Mar 21, 95 | AVENTIS PHARMA S.A. |
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| 5187273 | .DELTA..sup.4,9(11),17(20) -pregnatriene-3-ones | May 18, 92 | Feb 16, 93 | AVENTIS PHARMA S.A. |
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