1681-17-0 2,2-Bis(beta-cyanoethyl)-3-butanone 4-03-00-01855 (Beilstein Handbook Reference) 4-Acetyl-4-methylheptanedinitrile 4-Acetyl-4-methylpimelonitrile AI3-13063 BRN 1769600 HEPTANEDINITRILE, 4-ACETYL-4-METHYL- NSC 2767 NSC 404930