0 0 0 0 0 0 2933.59 Heterocyclic compounds with nitrogen hetero-atom[s] only, containing a pyrimidine ring, whether or not hydrogenated, or piperazine ring in the structure (excl. malonylurea ‘barbituric acid’and its derivatives, allobarbital ‘inn’, amobarbital ‘inn’, barbial ‘inn’, butalbital ‘inn’, butobarbital ‘inn’, cyclobarbital ‘inn’, methylphenobarbital ‘inn’, pentobarbital ‘inn’, phenobarbital ‘inn’, secbutabarbital ‘inn’, secobarbital ‘inn’, vinylbital ‘inn’, loprazolam ‘inn’, mecloqualone ‘inn’, methaqualone ‘inn’ 5