Most conductive polymers are prepared by oxidative coupling of monocyclic precursors. This is evidenced by the deformation in the allochtonous monocyclic belt. "Macrophomina phaseolina" has a monocyclic disease cycle. Important terpenoids derived from monocyclic terpenes are menthol, thymol, carvacrol and many others. The "Phialophora gregata" fungus is a deuteromycete with a monocyclic life cycle. Aromatic hydrocarbons can be "monocyclic" (MAH) or "polycyclic" (PAH). Other monocyclic aromatic hydrocarbon include Cyclotetradecaheptaene or Cyclooctadecanonaene. Fused aromatic rings consist of monocyclic rings that share their connecting bonds. Monocyclic amines have been found to cause mammary cancer in rats. This is a monocyclic disease meaning it only has one reproductive cycle a season. Annulenes, completely conjugated monocyclic hydrocarbons, may be aromatic, nonaromatic or antiaromatic. These components include straight chained, branched, cyclic, monocyclic aromatic and polycyclic aromatic hydrocarbons. Simple monocyclic aromatic rings are usually five-membered rings like pyrrole or six-membered rings like pyridine. Annulenes are monocyclic hydrocarbons that contain the maximum number of non-cumulated double bonds ('mancude').