| abstract |
Cyclosporins e.g. of formula II <IMAGE> (II) in which X is -MeBmt- or -dihydro-MeBmt- and Y is - alpha Abu-, -Thr-, -Val- or -Nva-, wherein the residue at the 3-position, i.e. the residue Z in formula II, is an optically active, alpha -N-methylated alpha -amino acid residue of the (D)-configuration, possess pharmaceutical, in particular immunosuppressive, anti-inflammatory and anti-parasitic activity. Intermediate cyclosporin poly-anions having a de-protonated sarcosyl residue at the 3-position, e.g. polyanions of cyclosporins of formula II above wherein X and Y have the meanings given above and Z is -Sar-, in which the said residue Z is de-protonated, are also novel and part of the invention. |