Wiktionary
benzathine
n. (context organic compound English) A diamine used in some medications to stabilize penicillin.
Wikipedia
Benzathine
Benzathine is a diamine used as a component in some medications including benzathine phenoxymethylpenicillin and benzathine benzylpenicillin. It stabilises penicillin and prolongs its sojourn when injected into tissues.
Category:Polyamines