| 摘要 |
PCT No. PCT/EP96/04417 Sec. 371 Date Apr. 15, 1998 Sec. 102(e) Date Apr. 15, 1998 PCT Filed Oct. 11, 1996 PCT Pub. No. WO97/15279 PCT Pub. Date May 1, 1997A compound of the formula I where R1 is i-propyl, i-butyl or t-butyl, R2 is alkyl with 6-14 carbon atoms, with R3=H or C1-C4-alkyl and m, n=0 or 1.
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