| http://www.w3.org/ns/prov#value | - ring(a) ??9(11) when R11 is a hydrogen atom, (b) 9??,11??-epoxide when R11 is an oxygen atom and between C11 and R11 is a single bond, and (c) a ketone when R11 is an oxygen atom and between C11 and R11 is a double bond; R16 is a hydrogen atom or methyl group; is a single or double bond; and ??? indicates that the attached atom or group can be in either the a or ?? configurations.
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