The invention relates to compounds having the formula (I): ##STR00001## Wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.9 and A-R.sub.9 are as defined herein. Also disclosed are the preparative methods for the compounds of formula (I) and their use in therapy.