| http://www.w3.org/ns/prov#value | - The aryl ring may be optionally substituted one or more times, preferably by one or two substituents, independently selected from C1-4 alkyl, halogen, especially fluoro or chloro, (CR10 R20)t OR11, (CR10 R20)t NR10 R20, especially amino or mono- or di-alkylamino; (CR10 R20)t S(O)m R18, wherein m is 0, 1 or 2; SH--, (CR10 R20)n NR13 R14, NR10 C(Z)R3 (such NHCO(C1-10 alkyl)); NR10 S(O)m R8 (such as
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