four commercially available penicillin preparations ( benzylpenicillin , aminobenzylpenicillin , carbenicillin and sulbenicillin ) and two kinds of the new semisynthetic penicillin preparations ( mezlocillin and piperacillin ) evoked systemic anaphylactic reactions in guinea pigs immunized with one of the following penicillin-ascaris extract ( as ) conjugates in aluminum hydroxide gel ( alum ) , i.e. , benzylpenicilloyl ( bpo ) -as , aminobenzylpenicilloyl ( abpo ) -as , carbenicilloyl ( cbpo ) -as , sulbenicilloyl ( sbpo ) -as , mezlocillin-as conjugate ( mez-as ) and piperacillin-as conjugate ( pip-as ) .
C0030827
benzylpenicillin
C0002680
aminobenzylpenicillin