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Adj.1.5-membered - of a chemical compound having a ring with five members5-membered - of a chemical compound having a ring with five members
membered - having members; normally used in chemistry in combination with a number
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Its derivatives have been presented as one of the most important biological classes of 5-membered heterocyclic compounds and their structural properties are found to form significant intermediates in the synthesis of nitrogen atom [2].
Azoles are heterocyclic compounds that are structurally related to the 5-membered ring compound pyrrole.
The occurrence of this large red shift is associated with the attachment of the phenyl group with the unsaturated 5-membered ring (Safari et al., 2012).
Boronic acids, organic derivatives of boric acid, can form stable 5-membered cyclic dioxaborolanes or 6-membered dioxaborinanes with polyols [7].
However, this rule cannot be satisfied for the smallest fullerene [C.sub.20], which contains twelve 5-membered rings (MRs) and zero 6-MRs.
From the four proposed structures of ML, Figures 4(c)-4(f), Figure 4(f) is favoured because of the two 5-membered chelate rings that are formed.

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