| http://www.w3.org/ns/prov#value | - n or oxygen atom, two hydrogen atoms, or ??- or ??-hydroxyl group which makes the C-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; R20 is --OC--R20 ' or --R20 ; R20 ' is alkyl of 1 thru
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