2-acetamidobutanedioic acid 2-acetamidosuccinic acid 2545-40-6 Oprea1_041445 NSC206260 Prestwick_712 Prestwick2_000415 Prestwick0_000415 ST5410864 NCGC00094595-01 Prestwick1_000415 EINECS 219-827-5 N-acetyl-DL-aspartic acid NSC128610 Aspartic acid, N-acetyl (R,S) Aspartic acid, N-acetyl-, DL- DL-Aspartic acid, N-acetyl- A5625_SIGMA NSC128611 SPBio_002309