The synthesis of two octapeptides, H · Asp(β‐NH 2 )‐Arg‐Val‐Tyr‐Val‐His‐Pro‐Phe · OH and H · Asp(β‐OH)‐Arg‐Val‐Tyr‐Val‐His‐Pro‐Phe · OH, is described in detail (preliminary communications see footnote 3). The products show a very strong hypertensive activity, and may be identical with the hitherto unknown Val 5 ‐hypertensin II of ox blood.
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Schwyzer et al. (1958) studied this question.
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