Snake venom natriuretic peptide that exhibits hypotensive and vasodepressor activity. Acts by activating natriuretic receptors (NPR1 and/or NPR2 and/or NPR3) (By similarity). A synthetic peptide (AA 77-108, where the Cys-95 is replaced by a Ser) increases sodium excretion and urinary volume in rat kidneys. Expressed by the venom gland. Belongs to the natriuretic peptide family.