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.
... the 13th century. John Wesley Powell, (1834-1902), explorer, environmentalist Nathaniel Pryor[?], (c 1785-1850), US explorer Pytheas, (died 1984), Greek explorer who ...