| http://www.w3.org/ns/prov#value | - elected from hydrido, alkyl, cycloalkyl, cyano, amino, monoalkylamino, dialkylamino, hydroxyalkyl, cycloalkylalkyl, alkoxyalkyl, haloalkylsulfinyl, haloalkylsulfonyl, aralkyl and aryl, and wherein each of R20 and R21 taken together and each of R22 and R23 taken together may form a heterocyclic group having five to seven ring members including the nitrogen atom of said amino or amido radical, which
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