2-Methyl-1-pyrroline872-32-2100 % similar 2-Acetyl-1-pyrroline85213-22-542 % similar 2-Pyrrolidone616-45-539 % similar 4-Acetamidobutyric acid3025-96-537 % similar Hexamethylene bisacetamide3073-59-436 % similar 1,4,5,6-Tetrahydro-1,2-dimethylpyrimidine4271-96-932 % similar 2-Piperidinone675-20-732 % similar Caprolactam105-60-231 % similar Octahydro-2H-azonin-2-one935-30-831 % similar Laurolactam947-04-631 % similar Acexamic acid57-08-930 % similar