| 摘要 |
Compounds of the formula I <IMAGE> (I) wherein R1 is hydrogen or C1-4alkyl, R2 is hydrogen, chlorine, bromine or methyl, R3 is C1-5alkyl or C3-5alkenyl and R4 is C3-7alkyl; C3-7cycloalkyl; adamantyl; or optionally substituted phenyl, having valuable pharmaceutical, and in particular LH- and PRL-secretion inhibiting as well as neuroleptic activity.
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