The chemical Piperacillin sodium has a designated molecular formula of C23H26N5NaO7S and a molecular weight of 539.539 g/mol. Synonyms may include: T 1220, CCRIS 2591, CL 227193, EINECS 261-868-6, Pentcillin, Pipracil, Sodium piperacillin, Piperacillin, UNII-M98T69Q7HP (ChemID). Piperacillin sodium has been assigned a MeSH pharmacological action of: Antibacterial.