17756-81-9 2-Chloro-N-(2-cyanoethyl)acetamide Acetamide, 2-chloro-N-(2-cyanoethyl)- BRN 2238620 CECA N-(beta-Cyanoethyl)chloroacetamide N-(beta-Cyanoethyl)monochloroacetamide NF 21 Udankor Udonkor