(S)-2-({5-[(3-Acetoxy-propyl)-(2-methyl-4-oxo-3,4-dihydro-quinazolin-6-ylmethyl)-amino]-thiophene-2-carbonyl}-amino)-pentanedioic acid diethyl ester

(S)-2-({5-[Ethyl-(2-methyl-4-oxo-3,4-dihydro-quinazolin-6-ylmethyl)-amino]-thiophene-2-carbonyl}-amino)-pentanedioic acid diethyl ester

(S)-2-({5-[Ethyl-(2-fluoromethyl-4-oxo-3,4-dihydro-quinazolin-6-ylmethyl)-amino]-thiophene-2-carbonyl}-amino)-pentanedioic acid diethyl ester