Tetrapeptidesemicarbazide derivatives and their production...

Details Tetrapeptidesemicarbazide derivatives and their production... Tetrapeptidesemicarbazide derivatives and their production...

C - Chemistry, Metallurgy

07

K

530/5.1

C07K 5/107 (2006.01) C07K 5/087 (2006.01)

Patent

CA 1157467

Abstract of the Disclosure Novel tetrapeptidesemicarbazide derivatives having the general formula (I): Image (I) wherein R1 is hydrogen or lower alkyl; R2 is hydrogen or a D-.alpha.-amino acid side chain; R3 is hydrogen or lower alkyl; and X is oxygen or sulfur, and pharma- cologically acceptable salts thereof, are useful as analgesics.

367412

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