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| Trade names | Securopen |
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| ECHA InfoCard | 100.048.483 |
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| Formula | C20H23N5O6S |
| Molar mass | 461.49 g·mol−1 |
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Azlocillin is anacylampicillinantibiotic with an extended spectrum of activity and greaterin vitro potency than the carboxypenicillins.Azlocillin is similar tomezlocillin andpiperacillin. It demonstrates antibacterial activity against a broad spectrum ofbacteria, includingPseudomonas aeruginosa, and, in contrast to mostcephalosporins, exhibits activity againstenterococci.
Azlocillin is considered a broad spectrum antibiotic and can be used against a number of Gram positive and Gram negative bacteria. The following represents MIC susceptibility data for a few medically significant organisms.[1]


An interesting alternative synthesis of azlocillin involves activation of the substitutedphenylglycine analogue1 with 1,3-dimethyl-2-chloro-1-imidazolinium chloride (2) and then condensation with6-APA.