| 摘要 |
A compound having the formula <IMAGE> wherein (1) -X-Y- is -L-Ala-L-Ala- and R is H, m-NO2, m-CF3, p-Cl, p-NO2, p-CF3, p-OCH3, p-CH(CH3)2, p-CN or p-COOH, (2) -X-Y- is -L-Lys-L-Ala- and R is H, p-CF3, p-CH3+L, p-CH(CH3)2, <IMAGE> or p-COCH3 (3) -X-Y- is <IMAGE> AND R is H, or (4) -X-Y- is -L-Lys-L-Lys or L-Ala-L-Lys and R is p-CF3.
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