| http://www.w3.org/ns/prov#value | - In another 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 hydroxyalkyl group and X includes one or more electrophilic leaving groups (e.g., a hydroxy alkyl halide).
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