prov:value
| - nd R4 is ???NHR5 and the remaining of R1, R2, R3, and R4 are hydrogen; [0020] R5 is hydrogen or alkyl of 1 to 8 carbon atoms; [0021] R6 is hydrogen, alkyl of 1 to 8 carbon atoms, benzyl, or halo; [0022] provided that R6 is other than hydrogen if X and Y are C???O and (i) each of R1, R2, R3, and R4 is fluoro or (ii) one of R1, R2, R3, or R4 is amino; and [0023] (b) the acid addition salts of said c
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