prov:value
| - The present invention also provides compounds of the formula (Group III): ##STR5## wherein X, Y, R1, R2, R3 and B are as described above; and R6 is ##STR6## where m is 0 or 1; n is 0 or 1; D is a direct bond or an amino acid selected from proline, isoleucine, cyclohexylalanine, cysteine optionally substituted at the sulfur with alkyl, alkenyl or phenyl optionally substituted with halogen, cyano, n
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