RESIDUE 1UC 20 CONECT O3 2 C6 H1 CONECT C6 3 O3 O4 C2 CONECT O4 1 C6 CONECT C2 3 C6 C C3 CONECT C 3 C2 C1 N CONECT C1 3 C O1 O CONECT O1 1 C1 CONECT O 2 C1 H4 CONECT N 3 C H5 H6 CONECT C3 3 C2 C4 H8 CONECT C4 3 C3 C5 H10 CONECT C5 3 C4 O2 H12 CONECT O2 1 C5 CONECT H1 1 O3 CONECT H4 1 O CONECT H5 1 N CONECT H6 1 N CONECT H8 1 C3 CONECT H10 1 C4 CONECT H12 1 C5 END HET 1UC 20 HETNAM 1UC (2E)-2-amino-3-[(1E)-3-oxoprop-1-en-1-yl]but-2-enedioic HETNAM 2 1UC acid FORMUL 1UC C7 H7 N1 O5