| abstract |
Compound of formula (I) ** Formula ** where RPD represents a group of formula ** Formula ** where the point of attachment with the respective O atom means, L1 means alkan- (C2-C4) - straight-chain diyl, L2 stands for straight- (C1-C3) alkan-straight-chain diyl, R1 and R3 are the same or different and stand for each other independently hydrogen or methyl (alanine), propan-2-yl (valine), propan -1-yl (norvaline), 2-methylopropan-1-yl (leucine), 1-methylopropan-1-yl (isoleucine), butan-1-yl (norleucine), tert-butyl (2-tert-butylglycine), phenyl (2-phenylglycine), benzyl (phenylalanine), p-hydroxybenzyl (tyrosine), indole-3-yl-methyl (tryptophan), imidazol-4-ylmethyl (histidine), hydroxymethyl (serine), 2-hydroxyethyl (homoserine) , 1-hydroxyethyl (threonine), mercaptomethyl (cysteine), methylthiomethyl (s-methylocysteine), 2-mercaptoethyl (homocysteine), 2-methylothioethyl (methionine), carbamoylmethyl (asparagine), 2-carbamoylethyl (glutamine), carboxymethyl (aspirin) ) , 2-carboxyethyl (glutamic acid), 4-aminobutan-1-yl (lysine), 4-amino-3-hydroxybutane-1-yl (hydroxylysine), 3-aminopropan-1-yl (ornithine), 2-aminoethyl ( 2,4-diaminobutyric acid), aminomethyl (2,3-diaminopropionic acid), 3-guanidinopropan-1-yl (arginine), 3-ureidopropan-1-yl (citrulline), R2 and R4 independently of one another represent hydrogen or methyl, or R1 and R2 or R3 and R4 are respectively attached to each other and together form with the atom to which they are attached together, a 3- to 6-membered saturated carbocycle, R5 signifies hydrogen or (C1-C4) alkyl, |