RESIDUE 2KZ 14 CONECT OD1 2 CG H1 CONECT CG 3 OD1 OD2 CB CONECT OD2 1 CG CONECT CB 3 CG CA H2 CONECT CA 3 CB N C CONECT N 3 CA H H4 CONECT C 3 CA O OXT CONECT O 1 C CONECT OXT 2 C HXT CONECT H1 1 OD1 CONECT H2 1 CB CONECT H 1 N CONECT H4 1 N CONECT HXT 1 OXT END HET 2KZ 14 HETSYN 2KZ (2E)-2-aminobut-2-enedioic acid HETNAM 2KZ 2-amino maleic acid FORMUL 2KZ C4 H5 N1 O4