In organic chemistry, a pyrrole is a five membered aromatic ring, 4 elements of which are carbonatoms, one element of which is a nitrogen atom. The molecular formula for a pyrrole is C4NH5. The structure is:
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dB is the abbreviation for Decibel; see Bel
DB is a French automobile maker; see DB (car)
DB is the abbreviation for Deutsche Bahn, the major ...