6-[(3-{[N,N'-bis[(1,1-dimethylethoxy)carbonyl]aminoiminomethyl]amino}pentyl)oxy]-3,4-dihydro-1-oxo-2(1H)-isoquinolineacetic acid 1,1-dimethylethyl ester

6-{[4-({[N,N'-bis[(1,1-dimethylethoxy)carbonyl]aminoiminomethyl]amino}methyl)phenyl]methoxy}-3,4-dihydro-1-oxo-2(1H)-isoquinolineacetic acid 1,1-dimethylethyl ester

6-{[3-({[N,N'-bis[(1,1-dimethylethoxy)carbonyl]aminoiminomethyl]amino}methyl)phenyl]methoxy}-3,4-dihydro-1-oxo-2(1H)-isoquinolineacetic acid 1,1-dimethylethyl ester

(6-{(Z)-2-[4-(tert-Butoxycarbonylamino-imino-methyl)-phenyl]-vinyl}-1-oxo-3,4-dihydro-1H-isoquinolin-2-yl)-acetic acid tert-butyl ester

(6-{(E)-2-[4-(tert-Butoxycarbonylamino-imino-methyl)-phenyl]-vinyl}-1-oxo-3,4-dihydro-1H-isoquinolin-2-yl)-acetic acid tert-butyl ester