| http://www.w3.org/ns/prov#value | - It will be seen that structures I and II differ in that the methinyl group to which A is attached is further substituted by A' in Structure I. In Structures I and II, n is an integer from 1-3 and D is a dihydroheterocyclic nucleus, represented by one or the other of the structural variations shown as Structure III. The free valences in the vinylenyl groups are usually attached to H but one may be
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