| http://www.w3.org/ns/prov#value | - Additional examples of R21 when R21 is alkylamino include (C1-C18 alkyl)???NR35 3X, where R35 is H or C1-C4 alkyl, such as methyl, for example, and X is a suitable counterion, such as F???, Br???, Cl???, I???, OH???, N3 ???, HCO3 ???, and CN???, for example.
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