tumor-promoting abilities of four barbiturates , phenobarbital [ ( pb ) cas : 50-06-6 ] , amobarbital [ ( ab ) cas : 57-43-2 ] , barbital sodium [ ( bb ) cas : 144-02-5 ] , and barbituric acid [ ( ba ) cas : 67-52-7 ] , on the development of neoplasms in livers and other organs of rats following initiation with n-nitrosodiethylamine [ ( dena ) cas : 55-18-5 ] were compared .
C0004745
barbiturates
C0002640
amobarbital