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:
... children under the age of 18 living with them, 62.2% are married couples living together, 17.0% have a female householder with no husband present, and 15.9% ar ...