CAS 1639939-40-4 appears in our catalog under these names: MC–Val–Ala–PAB–PNP, MC-Val-Ala-PAB-PNP/ 96.71% (existing batch purity), MC-Val-Ala-PAB-PNP, MC-Val-Ala-PAB-PNP 98%, N-[6-(2,5-Dihydro-2,5-dioxo-1H-pyrrol-1-yl)-1-oxohexyl]-L-valyl-N-[4-[[[(4-nitrophenoxy)carbonyl]oxy]methyl]phenyl]-L-alaninamide, 98%, 98%. Offered by: GLPBio, TargetMol, Iris Biotech, Biosynth, Ambeed. Available pack sizes: 10mg, 100mg, 5mg, 25mg, 50mg, 1g, 250mg, 5g.