It appears that there is some text missing from your request, as the sentence 'Helospectin II (suffusion at 0.' is incomplete. This does not give a full description of the activity of the chemical compound. Could you please provide the full sentence or additional context that describes the activity of Helospectin II? Once I have the complete sentence, I would be happy to rewrite it in Chinese and improve its clarity and conciseness as you requested.

Helospectin II（剂量范围0.03-2 nmol/kg，左颈静脉注射100 μL）可降低大鼠血压[2]。