Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PRIMAXIN 500 500 25S found under Imipenem And Cilast by Merck Sharp And Dohme Corp. The National Stock Number assigned to this part is 6505013324794, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PRIMAXIN 500 500 25S.