| http://www.w3.org/ns/prov#value | - gen, or an alkyl group, or an acid, or a sugar moiety; R2 is a hydrogen, or an alkyl group, or an acid, or a sugar moiety; R3 is OH, OR4, NH 2 , NHR5, wherein R4 and R5 independently represent an ester or an amide group of the compound and are described in more detail below.
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