| http://www.w3.org/ns/prov#value | - R4 is dialkylamino group, wherein said alkyl groups have from one to about six carbons, e.g. diisopropylamino, diethylamino, dimethylamino, or R4 is a cyclic substituent attached via a nitrogen atom that is part of the ring system, the ring system containing from 4 to 7 carbons and up to 3 heteroatoms, e.g. pyrrolidino, piperidino, morpholino, or alkyl substituted derivatives thereof;
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