RESIDUE 1RT 16 CONECT N1 3 C2 C6 H6 CONECT C2 3 N1 O2 N3 CONECT O2 1 C2 CONECT N3 2 C2 C4 CONECT C4 3 N3 N4 C5 CONECT N4 3 C4 H1 H2 CONECT C5 3 C4 C6 C21 CONECT C6 3 N1 C5 H4 CONECT C21 3 C5 O22 O23 CONECT O22 1 C21 CONECT O23 2 C21 H5 CONECT H1 1 N4 CONECT H2 1 N4 CONECT H4 1 C6 CONECT H5 1 O23 CONECT H6 1 N1 END HET 1RT 16 HETNAM 1RT 4-amino-2-oxo-1,2-dihydropyrimidine-5-carboxylic acid FORMUL 1RT C5 H5 N3 O3