prov:value
| - ), W and X replacing hydrogen on adjacent atoms (most usually adjacent carbon atoms), or A is a group of the formula ##STR3## in which W and X replace hydrogen on adjacent carbon atoms, m is from 0 to 6, provided that m is not more than 2unless R.sup.1 is exclusively halo,R.sup.1 is halo, amino, amidino, nitro, cyano, hydroxy, sulphamoyl, hydroxysulphonyl, carboxy, esterified carboxy, amidated car
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