prov:value
| - 1-2 radicals of hydroxy, methoxy, ethoxy, amino, methylamino, dimethylamino, acetylamino, cyano, halo, methyl, ethyl, trifluoromethyl or trifluoromethoxy; and each Z31 is independently ???O???, ???NR21???, ???NR21???C(O)???, ???C(O)???NR21???, ???NR21???S(O)2??? or ???S(O)2???NR21???; wherein R4 is a radical of hydrogen, C1-C6 alkyl, aryl, heteroaryl, aryl-C1-C4 alkyl, heteroaryl-C1-C4 alkyl or R2
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