Patent ID: 7645738

Claim:
A cyclic depsipeptide of formula (I) or salt thereof in which R 1 represents nitrobenzyl or R′R″N-benzyl where R′ and R″ independently of one another each represent hydrogen, optionally substituted C 1 -C 4 -alkyl, formyl, C 1 -C 4 -alkoxy-C 1 -C 4 -alkyl, C 1 -C 4 -alkoxycarbonyl, hydroxyl-C 1 -C 2 -alkylsulphonyl-C 1 -C 2 -alkyl, or R′ and R″ together with the nitrogen atom to which they are attached form an optionally substituted mono- or polycyclic saturated or unsaturated heterocycle which is optionally bridged and/or siprocyclic and which contains 1 to 3 further heteroatoms from the group consisting of nitrogen, oxygen and sulphur, or R′ and R″ together form C 3 -C 5 -alkylenemonocarbonyl or an optionally substituted diacyl radical of a C 4 -C 6 -dicarboxylic acid, and R 2 , R 3 and R 4 independently of one another represent C 1 -C 4 -alkyl, or an optical isomer thereof.