N,N'-dibenzylethylenediamine penicillin; a new repository form of penicillin.
D005029:Ethylenediamines; D010406:Penicillins / Q000031:analogs & derivatives
D005029:Ethylenediamines; D010406:Penicillins; C010044:benzathine; C006414:penicillin N
PENICILLIN/derivatives