this nonpeptide analogue , 20 , shows more potent converting enzyme inhibiting activity , i50 = 0.07 microm , than bz-phe-gly-pro , i50 = 9.4 microm , or than the orally active d-3-mercapto-2-methylpropanoyl-l-proline ( captopril , 1 ) , i50 = 0.30 microm .
C0033382
proline
C0006938
captopril