prov:value
| - -Ph-Ph, -Ph-Pyr, ???CHO, ???CH2CHO, ???CO???CH???CH2, ???CO???C(CH3)???CH2, ???CH2COOR5; the hydrogen on the carbon atoms constituting R4, when R4 is other than hydrogen, may be replaced by a linear or branched alkyl group of 1 to 4 carbon atoms, F, Cl, or Br, and the carbon in the aromatic ring may be replaced by nitrogen; and R5 is H, or an alkyl group of 1 to 5 carbon atoms]
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