| http://www.w3.org/ns/prov#value | - or an ester thereof, such as methyl or ethyl ester, or R12 is OH; preferably so that Rio is acetamido or acetamido group mimicking group or R12 is OH or so that Rio is acetamido or acetamido group mimicking group and R12 is OH or preferably so that two of the groups Rg, Rio and Ru docs not comprise OH as described above.
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