| http://www.w3.org/ns/prov#value | - In still another example, the sterically hindered polyamine is regioselective, having one of the following scenarios: i) a first NHR is secondary, while a second NHR is primary; ii) the first NHR is sterically hindered by one or more rings; A is the same or different moieties chosen from O, S, and NR, R being hydrogen or organic moieties having about 1???20 carbon atoms, such as 1???12 carbon atom
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