5545-17-5 Cystine, N,N'-diacetyl-, L- (8CI) EINECS 226-911-5 L-Cystine, N,N'-diacetyl- (9CI) N,N'-Diacetyl-L-cystine N,N'-Diacetylcystine N,N-Diacetylcystine NSC 203780