(3R,4S)-3,4-dimethylpyrrolidine-2,5-dione 2,5-pyrrolidinedione, 3,4-dimethyl-, (3R,4S)- InChI=1/C6H9NO2/c1-3-4(2)6(9)7-5(3)8/h3-4H,1-2H3,(H,7,8,9 cis-2,3-Dimethylsuccinimide