sh-Oligopeptide-205 SP Amide is a single chain human peptide produced synthetically to be identical to a portion of the protein, Natriuretic Peptides A, and contains 17 amino acids consisting of alanine, arginine, aspartic acid, cysteine, glutamine, glycine, isoleucine, leucine, methionine, phenylalanine and serine, in which the C-terminus is an amide. The parent protein contains a maximum of 151 amino acids which may contain disulfide bonds and/or glycosylation and consists of the proper sequence of the 20 standard amino acids.