Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NDC00015-5648-20 found under Butorphanol Tartrate Injection Usp by Novartis Pharmaceuticals Corporation. The National Stock Number assigned to this part is 6505013012299, 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 NDC00015-5648-20.