| http://www.w3.org/ns/prov#value | - is oxygen, ???NR4???, and mixtures thereof; Y is an anionic unit selected from the group consisting of ???(CH2)fCO2M, ???C(O)(CH2)fCO2M, ???(CH2)fPO3M, ???(CH2)fOPO3M, ???(CH2)fSO3M, ???CH2(CHSO3M)???(CH2)fSO3M, ???CH2(CHSO2M)???(CH2)fSO3M, ???C(O)CH2CH(SO3M)CO2M, ???C(O)CH2CH(CO2M)NHCH???(CO2M)CH2CO2M, ???CH2CH(OZ)CH2O(R1O)fZ, ???(CH2)fCH[O(R2O)fZ]CHfO???(B2O)fZ, and mixtures thereof; wherein Z i
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