RESIDUE 6HC 37 CONECT P 4 OP1 OP2 OP3 O5' CONECT OP1 1 P CONECT OP2 2 P HOP2 CONECT OP3 2 P HOP3 CONECT O5' 2 P C5' CONECT C5' 4 O5' C4' H5' H5'' CONECT C4' 4 C5' O4' C3' H4' CONECT O4' 2 C4' C6' CONECT C3' 4 C4' O3' C2' H3' CONECT O3' 2 C3' HO3' CONECT C2' 4 C3' C1' H2' H2'' CONECT C1' 4 C2' C6' N1 H1' CONECT C6' 4 O4' C1' H6'1 H6'2 CONECT N1 3 C1' C2 C6 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 H41 H42 CONECT C5 3 C4 C6 H5 CONECT C6 3 N1 C5 H6 CONECT HOP2 1 OP2 CONECT HOP3 1 OP3 CONECT H5' 1 C5' CONECT H5'' 1 C5' CONECT H4' 1 C4' CONECT H3' 1 C3' CONECT HO3' 1 O3' CONECT H2' 1 C2' CONECT H2'' 1 C2' CONECT H1' 1 C1' CONECT H6'1 1 C6' CONECT H6'2 1 C6' CONECT H41 1 N4 CONECT H42 1 N4 CONECT H5 1 C5 CONECT H6 1 C6 END HET 6HC 37 HETNAM 6HC 1',5'-ANHYDRO-2',3'-DIDEOXY-2'-(CYTOSIN-1-YL)-6'-O-PHOS HETNAM 2 6HC PHORYL-D-ARABINO-HEXITOL FORMUL 6HC C10 H16 N3 O7 P1