A compound according to formula I: wherein R1: H, alkyl, aryl, heteroaryl, cycloalkyl, hydroxyalkyl, arylalkyl, alkylheteroaryl, aminoalkyl, aminocarbonyl, alkylaminocarbonyl, alkylcarbonyl, mercaptoalkyl, sulfidoalkyl, preferably an R residue of an amino acid, wherein said residues are optionally substituted, R2: alkyl, aryl, alkoxyalkyl, cycloalkyl, mercaptoalkyl, sulfidoalkyl, arylalkyl, fluoroalkyl R3: OH, alkyl, O-alkyl, O-aryl, NRR' (R, R': H or alkyl), NROR' (R, R': H, alkyl), heteroaryl, R4: H, alkyl, acyl, aryl, heteroaryl, cycloalkyl, alkylheteroaryl, alkylcarbonyl, arylalkyl, arylcarbonyl, alkoxycarbonyl, aminocarbonyl, aryloxycarbonyl, alkylsulfonyl, arylsulfonyl, aminoacyl and/or peptidyl, or R5, wherein said residues are optionally substituted, R5: Z: bond to the structure according to formula I, R6: H, alkyl, aryl, cycloalkyl, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, arylalkyl, aminocarbonyl, aryloxycarbonyl, alkylsulfonyl, arylsulfonyl, aminoacyl and/or peptidyl, wherein said residues are optionally substituted, or Y: bond to the structure according to R5, R7: H, alkyl, aryl, heteroaryl, cycloalkyl, hydroxyalkyl, arylalkyl, alkylheteroaryl, aminoalkyl, aminocarbonyl, alkylaminocarbonyl, alkylcarbonyl, mercaptoalkyl, sulfidoalkyl, preferably an R residue of an amino acid, wherein said residues are optionally substituted, R8: H, alkyl, aryl, acyl, heteroaryl, cycloalkyl, alkylheteroaryl, alkylcarbonyl, arylalkyl, arylcarbonyl, alkoxycarbonyl, aminocarbonyl, aryloxycarbonyl, alkylsulfonyl, arylsulfonyl, aminoacyl and/or peptidyl, wherein said residues are optionally substituted. R1: H, alkyl, aryl, heteroaryl, cycloalkyl, hydroxyalkyl, arylalkyl, alkylheteroaryl, aminoalkyl, aminocarbonyl, alkylaminocarbonyl, alkylcarbonyl, mercaptoalkyl, sulfidoalkyl, preferably an R residue of an amino acid, wherein said residues are optionally substituted, R2: alkyl, aryl, alkoxyalkyl, cycloalkyl, mercaptoalkyl, sulfidoalkyl, arylalkyl, fluoroalkyl R3: OH, alkyl, O-alkyl, O-aryl, NRR' (R, R': H or alkyl), NROR' (R, R': H, alkyl), heteroaryl, R4: H, alkyl, acyl, aryl, heteroaryl, cycloalkyl, alkylheteroaryl, alkylcarbonyl, arylalkyl, arylcarbonyl, alkoxycarbonyl, aminocarbonyl, aryloxycarbonyl, alkylsulfonyl, arylsulfonyl, aminoacyl and/or peptidyl, or R5, wherein said residues are optionally substituted, R5: Z: bond to the structure according to formula I, R6: H, alkyl, aryl, cycloalkyl, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, arylalkyl, aminocarbonyl, aryloxycarbonyl, alkylsulfonyl, arylsulfonyl, aminoacyl and/or peptidyl, wherein said residues are optionally substituted, or Y: bond to the structure according to R5, R7: H, alkyl, aryl, heteroaryl, cycloalkyl, hydroxyalkyl, arylalkyl, alkylheteroaryl, aminoalkyl, aminocarbonyl, alkylaminocarbonyl, alkylcarbonyl, mercaptoalkyl, sulfidoalkyl, preferably an R residue of an amino acid, wherein said residues are optionally substituted, R8: H, alkyl, aryl, acyl, heteroaryl, cycloalkyl, alkylheteroaryl, alkylcarbonyl, arylalkyl, arylcarbonyl, alkoxycarbonyl, aminocarbonyl, aryloxycarbonyl, alkylsulfonyl, arylsulfonyl, aminoacyl and/or peptidyl, wherein said residues are optionally substituted.