1,4-Dimethyl-2,5-dioxopiperazine 1,4-Dimethylpiperazine-2,5-dione 2,5-Piperazinedione, 1,4-dimethyl- (8CI)(9CI) 5076-82-4 Cyclo (sar-sar) EINECS 225-788-5 N,N'-Dimethyldiketopiperazine NSC 67461 Sarcosine anhydride Sarcosine anhydride, bimol. cyclic; Sarcosine diketopiperazine Sarcosine diketopiperazine