Acth (4-10)

Formula : C44-H59-N13-O10-S
CAS : 4037-01-08 

Part of ACTH molecule containing amino acids 4-10 of total 39 amino acid chain; heptapeptide common to MSH & ACTH.

Acth (6-9)

Formula : C32-H40-N10-O5
CAS : 4289-02-05 

Tetrapeptide which is the biologically active amino acid sequence of alpha-MSH.