prov:value
| - 4 carbon atoms, or alkoxy of 1 to 4 carbon atoms or (ii) one of R1, R2, R3, and R4 is ???NHR5 and the remaining of R1, R2, R3, and R4 are hydrogen; R5 is hydrogen or alkyl of 1 to 8 carbon atoms; R6 is hydrogen, alkyl of 1 to 8 carbon atoms, benzyl, or halo; 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 i
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