| http://www.w3.org/ns/prov#value | - (--CO--); (b) a carboxyl group (--COO--); (c) a sulphone (--SO.sub.2--); (d) an alkene (--CH.dbd.C(R)--) where R may be for a straight chain alkyl group having for example 1 to about 20 carbon atoms, particularly 1 to about 12 carbon atoms, such as
|
