| http://www.w3.org/ns/prov#value | - h a compound of the formula R7 X, R7 being alkyl, alkenyl, alkynyl, cycloalkyl, dialkylaminoalkyl or aralkyl as defined above and X is a halogen atom such as chlorine, bromine or iodine, for example methyl iodide, allyl bromide, benzyl bromide and diethylaminoethyl chloride, or with a compound of the formula (R7)2 SO4 in which R7 stands for an alkyl radical as defined above, for example (CH3)2 SO4
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