Which one of the following drugs does not have active metabolite ?

- Among the given options, only Lisinopril does not have an active metabolite. Except for Captopril and Lisinopril, all Angiotensin Converting Enzyme (ACE) inhibitors are prodrugs. - Diazepam produces Oxazepam and many other active metabolites. - Propranolol can give rise to 4-hydroxyPropranolol which has β antagonist activity - Oxypurinol is produced from Allopurinol.