RESIDUE 1LD 13 CONECT N1 3 C6 C2 H1 CONECT C6 3 N1 C5 H2 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 H3 H4 CONECT C5 3 C6 C4 F CONECT F 1 C5 CONECT H1 1 N1 CONECT H2 1 C6 CONECT H3 1 N4 CONECT H4 1 N4 END HET 1LD 13 HETSYN 1LD 4-amino-5-fluoropyrimidin-2(1H)-one HETNAM 1LD 5-fluorocytosine FORMUL 1LD C4 H4 F1 N3 O1