138506-90-8 Anp (1-27) Atrial natriuretic factor (1-27) Atriopeptin-21 (rat reduced), N-(N-(N2-L-seryl-L-lysyl)-L-seryl)-2a-endo-L-proline-7-L-lysine-8-L-leucine-13-L-serine-14-L-tyrosine-21a-L-arginine-21b-L-lysine-