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US 4,565,653 AGranted
Acyltripeptide immunostimulants
AssigneePfizer Inc.
InventorsJeffrey L. Ives, Frank C. Sciavolino
Life of this patent
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Abstract
Acyltripeptides having the formula below, pharmaceutically acceptable salts thereof and intermediates therefor; processes for their preparation and use as immunostimulant and antibacterial agents. ##STR1## wherein R.degree. is C.sub.1-6 alkyl; x is an integer and is 1 to 4.
Claims9
A compound having formula (I) ##STR9## wherein R.degree. is alkyl having from one to six carbon atoms, and x is an integer from 1 to 4.
A compound having the formula III ##STR10## wherein R.degree. is alkyl having from one to six carbon atoms;
- each of Y.sup.1 and Y.sup.4 is a carboxy protecting group;
- Y.sup.5 is an amino protecting group;
- and Y.sup.3 is ##STR11## wherein x is an integer from 1 to 4.
Dependencies are inferred from the claim text.