heptalysine and also lysine were reacted with benzylpenicillin , alpha-aminobenzylpenicillin and tert.-butyloxycarbonyl-alpha aminobenzylpenicillin -- to prevent the alpha-amino groups of penicillin from reacting -- in aqueous solutions at ph 10.6-11.6 according to levine and redmond .
C0030827
benzylpenicillin
C0002680
aminobenzylpenicillin