| http://www.w3.org/ns/prov#value | - Other specific zwitterionic surfactants have the generic formulas: R1???C(O)???N (R2)???(C(R3)2)n???N(R2)2(+)???(C(R3) 2)n???SO3(???) or R1???C(O)???N (R2)???(C(R3)2)n???N(R2)2(+)???(C(R3)2)n???COO(???) wherein each R1 is a hydrocarbon, e.g. an alkyl group containing from 8 up to 20, or up to 18, or up to 16 carbon atoms, each R2 is either a hydrogen (when attached to the amido nitrogen), short ch
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