| http://www.w3.org/ns/prov#value | - specified for R1, a hydrogen atom, or a hydrocarbyl or substituted hydrocarbyl group not having a terminal chain of at least six carbon atoms and an organic base nitrogen compound having the formula: ##STR3## wherein Z1 is a group as specified for R1 above and Z2 and Z3 which may be the same or different are as specified for R2 above.
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