Patent ID: 8481537

Claim:
A compound of formula (1): in which I) R 1 represents H, C 1 -C 5 -alkyl, C 3 -C 10 -cycloalkyl, aryl, or a side chain of a natural amino acid selected from the group consisting of —CH 3 , —(CH 2 ) 3 —NH—C(NH 2 )═NH, —CH 2 —CO—NH 2 , —CH 2 —COOH, —CH 2 —SH, —(CH 2 ) 2 —CO—NH 2 , —(CH 2 ) 2 —COOH, —CH(CH 3 )—CH 2 —CH 3 , —CH 2 —CH—(CH 3 ) 2 , —(CH 2 ) 4 —NH 2 , —(CH 2 ) 2 —S—CH 3 , —CH 2 -phenyl —CH 2 —OH, —CH(OH)—CH 3 , —CH 2 -phenyl-OH, and —CH—(CH 3 ) 2 II) R 2 represents H, C 1 -C 5 -alkyl, C 3 -C 10 -cycloalkyl, aryl, or a side chain of a natural amino acid selected from the group consisting of CH 3 , —(CH 2 ) 3 —NH—C(NH 2 )═NH, —CH 2 —CO—NH 2 , —CH 2 —COOH, —CH 2 —SH, —(CH 2 ) 2 —CO—NH 2 , —(CH 2 ) 2 —COOH, —CH(CH 3 )—CH 2 —CH 3 , —CH 2 —CH—(CH 3 ) 2 , —(CH 2 ) 4 —NH 2 , —(CH 2 ) 2 —S—CH 3 , —CH 2 -phenyl, —CH 2 —OH, —CH(OH)—CH 3 , —CH 2 -phenyl-OH, and —CH—(CH 3 ) 2 III) R 3 represents H, C 1 -C 5 -alkyl, hydroxy, C 1 -C 5 -alkoxy, or halogen, IV) R 4 represents H, C 1 -C 5 -alkyl, C 3 -C 10 -cycloalkyl, or aryl, V) R 5 represents H, C 1 -C 5 -alkyl, C 3 -C 10 -cycloalkyl, or aryl, VI) R 6 and R 7 independently of one another each represent H, C 1 -C 5 -alkyl, C 3 -C 10 -cycloalkyl, or aryl, VII) X represents —CH 2 OR 9 (R 9 is C 1 -C 5 -alkyl, C 3 -C 10 -cycloalkyl, or aryl), —CH 2 OC(═O)R 10 (R 10 is C 1 -C 5 -alkyl, C 3 -C 10 -cycloalkyl, or aryl), —CH 2 —OP(═O)R 2 11 (R 11 is C 1 -C 5 -alkyl, C 3 -C 10 -cycloalkyl, or aryl), or —CH 2 —W (W is halogen), or pharmaceutically acceptable salt thereof.