| http://www.w3.org/ns/prov#value | - ed as above, each R1 is hydrogen or methyl, R2 and R3 together represent a trimethylene group or a tetramethylene group or individually are hydrogen atoms, lower alkyl groups (e.g., 1-8 carbon atoms), phenyl groups, benzyl groups, or R2 is a hydrogen atom and R3 is
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