| http://www.w3.org/ns/prov#value | - In the structure of (57), R.sub.5 and R.sub.6 can be identical, R.sub.4 and R.sub.5 can be the same or different alkylene groups having about 2 40 carbon atoms, such as about 2 20, about 2 10, or about 2 4 carbon atoms, R.sub.3 can be the
|
