| http://www.w3.org/ns/prov#value | - , ???CONH???, (CH2)qO???, (CH2)qNH???, and ???(CH2)qS(O)r???; wherein p is an integer from 0 to 6, q is an integer from 0 to 6, and r is 0, 1 or 2; and Z is substituted or unsubstituted alkyl, substituted or unsubstituted amino, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl or substituted or unsubstituted heterocycloalkyl group; or R42 is of the formula wherein
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