prov:value
| - 0 or 1; j and k are independently 1-5, provided that the sum of j, k and v is 1-5; and when Q is a bond and R1 is Ar1 can also be pyridyl, isoxazolyl, furanyl, pyrrolyl, thienyl, imidazolyl, pyrazolyl, thiazolyl, pyrazinyl, pyrimidinyl or pyridazinyl; R19 and R20 are independently selected from the group consisting of H, (C1-C6)alkyl, aryl and aryl-substituted (C1-C6)alkyl; R21 is (C1-C6)alkyl, a
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