Novel title cpds. have formula (where R1 = Cl, CF3 or SCF3 in the 7 or 8 position; R2 = phenyl opt. substd. by 1 or 2 Cl, CH3, CF3, OCFo or SCF3 gps., with the condition that the R2 phenyl gp. is substd. when R1 = Cl) including their acid addition salts.
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