Redirected from Heterocyclic
That is, unlike the carbon-only ring like in benzene and napthalene, there are other elements in the backbone, such as in pyrimidine and purine.
... (U.S.A.) of 1905 the southern part of the island below 50° N was ceded to Japan, the Russians retaining the other three-fifths of the area. In August 1945, Russia again ...