| http://www.w3.org/ns/prov#value | - In one preferred example, one of the alkylating agents has the formula RX where R is a C1-C20 alkyl group and X includes one or more electrophilic leaving groups (e.g., an alkyl halide), and the other alkylating agent has the formula R???X where R??? is a C1-C20 alkyl ammonium group and X includes one or more electrophilic leaving groups (e.g., an alkyl halide ammonium salt).
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