| http://www.w3.org/ns/prov#value | - In case that the hydrophilic substituent of B or B??? is a radical ???COOY, Y as optionally substituted alkyl is preferably C1-C6-alkyl, more preferably C1-C4-alkyl, even more preferably C1-C3-alkyl and particularly preferably methyl or ethyl, each of which being unsubstituted or substituted as mentioned above.
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