| http://www.w3.org/ns/prov#value | - Stable dioxetanes useful in practicing the present invention may be of the formula: ##STR2## wherein R1 is a hydrophilic organic group comprising a substituted alkyl, heteroalkyl, alkenyl or alkynyl group containing 1 to 20 carbon atoms, at least two groups which provide increased solubility in aqueous solution and optionally containing one or more atoms selected from the group consisting of oxyge
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