In the present study on the development of new anticonvulsants, twenty new 6-methyl-1- substituted-4, 6-diazaspiro [2.4] heptane-5, 7-diones were synthesized and tested for anticonvulsant activity using the maximal electroshock (MES) and subcutaneous pentylenetetrazole (scPTZ) screens. Their neurotoxicity was determined by the rotorod test. In this series, all of the alkyl-and aryl-substituted 5, 5-cyclopropanespirohydantoins ...