prov:value
| - lkenyl, cycloalkyl, heterocycloalkyl, aryl or substituted aryl group; R2 is hydrogen, alkyl, alkenyl, cycloalkyl, heterocycloalkyl, aryl or substituted aryl group; R3 is hydrogen, alkyl, alkenyl, cycloalkyl, heterocycloalkyl or aryl group; and R4 is an aryl or substituted aryl group; wherein 2<x+y+z???3; wherein when x is 0, m is 0; when y is 0, n is 0; and when z is 0, p is 0.
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