| http://www.w3.org/ns/prov#value | - Compounds of formula IA wherein one or both of R and R' represents a straight or branched-chain alkyl, alkenylalkyl or alkynylalkyl group containing up to 5 carbon atoms, groups represented by R and R' being identical, may be prepared by reaction of a compound of formula I, wherein R3 represents the unsubstituted amino group, or an alkali metal, e.g. sodium or potassium, derivative thereof, wi
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