A (+) or (-) enantiomer of a compound of formula (I) wherein R.sup.4 is methyl or ethyl, or a salt, solvate or hydrate thereof, processes for preparing said compounds and pharmaceutical compositions containing them. Compounds of formula (+) are 5-HT.sub.1 -like agonists. ##STR1##
化合物的(+ )或(- )对映体公式(I)其中R.sup.4是甲基或乙基,或其盐,溶剂合物或
水合物,制备上述化合物的过程以及含有它们的药物组合物。公式(+)的化合物是5-HT.sub.1 -like激动剂。 ##STR1##