1-Pyrrolidinebutanenitrile 1-Pyrrolidinebutyronitrile 35543-25-0 4-(1-Pyrrolidine)butyronitrile 4-Pyrrolidin-1-ylbutyronitrile 5-20-01-00354 (Beilstein Handbook Reference) BRN 1341555 EINECS 252-612-4