| abstract |
(57) Abstract: The present invention provides a compound represented by the general formula (I) wherein R 1 , R 2 , R 3 and X may be the same or different, and R 1 and R 2 are hydrogen, amino acid, Puchijiru, alkyl or aryl residue, R 3 is hydroxy, represents lower alkoxy or -NR 31 R 32 residue, R 3 1, R 32 is independently hydrogen, amino, peptidyl, alkyl or X represents an amino acid or a peptide; R 4 represents hydrogen, hydroxy, amino or C 1 -C 4 alkyl; m represents a number from 0 to 5 ; C 1 , which represents an optionally substituted saturated or unsaturated monocyclic or bicyclic group which may contain one or more atoms, or which may have substituents or intermittent heteroatoms, compounds of representing a -C 11 alkyl group), their tautomers, optical isomers Relates to the use as pharmaceutically acceptable salts and prodrugs thereof as well as production and drug thereof. Embedded image |