| http://www.w3.org/ns/prov#value | - A method for inhibiting interleukin-1?? converting enzyme in a mammal comprising administering an effective amount of a compound of the formula: ##STR62## wherein R1 is a hydrogen atom or an acyl group;R2, R3 and R4, are the same or are different, and are a bond, an amino acid residue or a group of the formula: --Y--R5 -- in which R5 is a group resulting from removing the imino group from an amino
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