摘要:
The invention provides compounds of formula I wherein R1 to R6 are as defined in the description, and a process for preparing them. The compounds of formula I are useful as pharmaceuticals.
摘要:
The invention provides compounds of formula I ##STR1## wherein X, Y, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are as defined in the description, and a process for preparing them. The compounds of formula I are useful as pharmaceuticals.