| http://www.w3.org/ns/prov#value | - y, 3-(4-n-butoxy-5-methoxy)benzylidenecamphor-10-sulfonic acid. ##STR7## in which R11 is a hydrogen atom or a linear or branched alkyl or alkoxy radical having from about 1 to 6 carbon atoms or an --SO3 H radical, R12 is a hydrogen atom or a linear or branched alkyl or alkoxy radical having from about 1 to 6 carbon atoms, R13 is a hydrogen atom or an --SO3 H radical, at least one of the radicals R
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