2-Amino-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carbonitrile 2-Amino-3-cyanocyclopentano(b)thiophene 2-Amino-5,6-dihydro-4 H -cyclopenta[ b ]thiophene- 2-Amino-5,6-dihydro-4 H -cyclopenta[ b ]thiophene-3-carbonitrile 2-Amino-4,5-trImethylene-3-thiophenecarbonitrile Aminotrimethylenethiophenecarbonitrile 2-Amino-5,6-dihydro-4H-cyclopenta[b]thiophene-