| http://www.w3.org/ns/prov#value | - of hydrogen, alkali metals, alkaline earth metals, and NR4 and PR4 wherein R is a hydrogen atom or a substituted or unsubstituted hydrocarbyl radical having 1 to 15 carbon atoms and each R can be alike or different or (b) a trivalent phosphorus atom connected through a group having the formula ##STR36## wherein A is an oxygen atom, an NH radical, or an NR radical; R2 and R3 are hydrogen atoms or a
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