| 摘要 |
A compound of the formula: <IMAGE> (I) in which each R1 to R4 group is hydrogen, C1-4 alkyl, C1-4 alkoxy, C1-4 alkoxy-carbonyl, halo, hydroxy, nitro, cyano, trihalomethyl or optionally substituted phenyl, each R5 to R16 group is hydrogen or C1-4 alkyl, each Z', Z'', Z''' and Z'''' group is an alkylene radical, and X and Y are each -(CH2)n- or -(CH2)m-A-(CH2)p- where A is -CH=CH-, optionally substituted phenylene or optionally substituted naphthalenyl, n is 2 to 10, and m and p are each 1 or 2, salts thereof, and intermediates for the production thereof.
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