| 摘要 |
PCT No. PCT/EP97/03671 Sec. 371 Date Jan. 8, 1999 Sec. 102(e) Date Jan. 8, 1999 PCT Filed Jul. 10, 1997 PCT Pub. No. WO98/02423 PCT Pub. Date Jan. 22, 1998The invention relates on the one hand to a novel preparation of compounds of the formula (I) in which R1 is an aromatic or heteroaromatic radical, aromatic-aliphatic or heteroaromatic-aliphatic radical, a heterocyclic radical, a cycloaliphatic radical, a cycloaliphatic-aliphatic radical or an aliphatic radical, and on the other hand to novel compounds of the formula (I).
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