| http://www.w3.org/ns/prov#value | - a) H, halogen, OCH3, OH; or where X is O, NH or S; and n is an integer from 1 to 4; and R4 and R5, which are the same or different, are a 1 to 4 carbon alkyl, H. ???CH2C???CH or ???CH2CH2OH; or R4 and R5 form an N-containing five- or six-membered ring or heteroaromatic ring; or c) ???Y???(CH2)nCH2???O???R6
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