Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SLO-PHYLLIN 250 GYROCAPS found under Theophylline Extend by Aventis Pharmaceuticals Products. The National Stock Number assigned to this part is 6505010718971, 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 SLO-PHYLLIN 250 GYROCAPS.