Alphenal, also known as 5-allyl-5-phenylbarbituric acid, is a barbiturate derivative developed in the 1920s.[1] It has primarily anticonvulsant properties and was used occasionally for the treatment of epilepsy or convulsions, although not as commonly as better known barbiturates such as phenobarbital.[2][3][4][5]
LD50: Mouse (Oral): 280 mg/kg
References
^DE 526854, "Verfahren zur Darstellung von C,C-disubstituierten Barbitursaeuren", issued 11 June 1931, assigned to Hoffmann La Roche