prov:value
| - Among the preferred compounds of formula I are those where R1 is methoxy, ethyl or hydrogen, those wherein n is 2 or 3, those where R2 is methoxy, chlorine, fluorine or --CF3, those wherein R3 and R4 are alkyl, especially methyl or ethyl, those wherein R3 and R4 together with the nitrogen atom form pyrrolindinyl or morpholinyl and those wherein A is isopropyl and, of course, their acid addition sa
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