The present invention relates to compounds of formula (I), or the tautomers or pharmacologically acceptable acid addition salts thereof, wherein R1, R2, R3, R4, X, and Z have one of the meanings as defined in the specification, to the use of compounds of formula (I) as a medicament, to pharmaceutical composition comprising at least one compound of formula (I), as well as to medicament combinations containing one or more compounds of formula (I).
