The invention relates to compounds of formula (I): ##STR1## wherein R.sup.1 represents alkyl or ureido, R.sup.2 represents alkyl or hydrogen, or R.sup.1 and R.sup.2 together form a 5- or 6-membered ring, R.sup.3 represents CN, NO.sub.2, NR.sub.a R'.sub.a, NR.sub.a SO.sub.2 R'.sub.a, NR.sub.a CZR.sup.5 or CZNR.sub.a R'.sub.a, R.sup.4 represents hydrogen or R.sup.3, and medicinal products containing the same which are useful in treating or preventing epilepsy and neurodegenerative diseases.
The invention relates to compounds of formula (I): wherein R.sup.1 represents an alkyl or ureido group, R.sup.2 represents an alkyl group or a hydrogen atom, or R.sup.1 and R.sup.2 together form a 5- or 6-membered ring, R.sup.3 represents a group CN, NO.sub.2, NR.sub.aR'.sub.a, NR.sub.aSO.sub.2,R'.sub.aCZR.sup.5 or CZNR.sub.aR'.sub.a, R.sup.4 represents a hydrogen atom or a group R.sup.3. 1