The invention concerns compounds of formula (1): R-A-R' wherein: A is as defined in the description; R represent a group (V), (VI), (VII), or (VIII), where E, Q, R.sup.1, R.sup.2, R.sup.3, v and R.sup.4 are as defined in the description; R' represents a --(CH.sub.2).sub.t--R.sup.5 group wherein t and R.sup.5 are as defined in the description, and medicaments containing the same ##STR00001##