| http://www.w3.org/ns/prov#value | - The compounds of the general formula (I) according to the present invention may be prepared by the following scheme I. ##STR3## wherein R1, R2, R3, R4, R5, R6, R7, A, X, Y and Z are as defined above, and Lie is a leaving group such as halogen atom, sulfonyl or the like.
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