in the present studies , angiotensin ii has also been removed from di rats by the administration of an inhibitor ( captopril , sq 14225 ; d-2-methyl-3-mercaptopropanoyl-l-proline ) of the enzyme which converts angiotensin i , the relatively inert component of the renin-angiotensin system , to angiotensin ii , the biologically active substance .
C0006938
captopril
C0033382
proline