RESIDUE A6U 37 CONECT P 4 O5' OP1 OP2 OP3 CONECT N1 3 C2 C6 C1' CONECT C2 3 N1 O2 N3 CONECT O2 1 C2 CONECT N3 3 C2 C4 HN3 CONECT C4 3 N3 O4 C5 CONECT O4 1 C4 CONECT C5 3 C4 C6 H5 CONECT C6 3 N1 C5 H6 CONECT C1' 4 N1 C2' C6' H1' CONECT C2' 4 C1' O2' C3' H2' CONECT O2' 2 C2' HO2' CONECT C3' 4 C2' O3' C4' H3' CONECT O3' 2 C3' HO3' CONECT C4' 4 C3' O4' C5' H4' CONECT O4' 2 C4' C6' CONECT C5' 4 C4' O5' H5' H5'A CONECT O5' 2 P C5' CONECT C6' 4 C1' O4' H6' H6'A CONECT OP1 1 P CONECT OP2 2 P HOP2 CONECT OP3 2 P HOP3 CONECT H5 1 C5 CONECT H6 1 C6 CONECT H1' 1 C1' CONECT H2' 1 C2' CONECT HO2' 1 O2' CONECT H3' 1 C3' CONECT HO3' 1 O3' CONECT H4' 1 C4' CONECT H5' 1 C5' CONECT H5'A 1 C5' CONECT H6' 1 C6' CONECT H6'A 1 C6' CONECT HOP2 1 OP2 CONECT HOP3 1 OP3 CONECT HN3 1 N3 END HET A6U 37 HETSYN A6U ((2R,3S,4S,5R)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)- HETSYN 2 A6U yl)-3,4-dihydroxytetrahydro-2H-pyran-2-yl)methyl dihydr HETSYN 3 A6U ogen phosphate HETNAM A6U 1,5-anhydro-2-deoxy-2-(2,4-dioxo-3,4-dihydropyrimidin-1 HETNAM 2 A6U (2H)-yl)-6-O-phosphono-D-altritol FORMUL A6U C10 H15 N2 O9 P1