ethyl 2-cyano-2-(1-methylpyrrolidin-2-ylidene)acetate

N-甲基吡咯烷酮

3,3-dichloro-N-methyl-2-thiopyrrolidinone

3,3-dichloro-1-methylpyrrolidine-2-thione

methyl 2-cyano-2-(1-methylpyrrolidin-2-ylidene)acetate