Disclosed are compounds of general formula (I), ##STR00001## wherein the groups R.sup.1, R.sup.2, R.sup.a and R.sup.b have the meanings given in the claims and specification, the tautomers, racemates, enantiomers, diastereomers and the mixtures thereof, and optionally the pharmacologically acceptable acid addition salts, solvates and hydrates thereof, and processes for preparing these thiazolyl-dihydro-cyclopentapyrazoles and the use thereof as pharmaceutical compositions.