| http://www.w3.org/ns/prov#value | - For these compounds, the variable groups at the 1, 2, 4, 6, 11 and 12 positions may comprise one, two or three moieties other than hydrogen, e.g., optionally substituted alkyl, optionally substituted alkoxy, optionally substituted alkylaryl, an ester, an ether, a thioether, a thioester, an optionally substituted heterocycle, or an optionally substituted monosaccharide, while the remainder of the v
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