Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NDC00006-3919-68 found under Carbidopa And Levodopa Extended Release Tablets by Merck And Co Inc. The National Stock Number assigned to this part is 6505013433482, 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 NDC00006-3919-68.