Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PRINCIPEN 250 found under Ampicillin For Oral by Squibb E R And Sons Inc. The National Stock Number assigned to this part is 6505009356535, 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 PRINCIPEN 250.