2E4Mz-cn23996-25-0100 % similar 1-Cyanoethyl-2-methylimidazole23996-55-643 % similar 2Pz-cn23996-12-534 % similar 2-Ethyl-4-methylthiazole15679-12-632 % similar 2-Ethyl-3,5-dimethylpyrazine13925-07-030 % similar