RESIDUE 54H 53 CONECT C4 3 C5 N3 N9 CONECT C5 3 C4 C6 N7 CONECT C6 3 C5 N1 N6 CONECT C8 3 N9 N7 H8 CONECT N1 2 C6 C2 CONECT N3 2 C4 C2 CONECT CG2 4 CB HG2 HG2A HG2B CONECT CB 4 CG2 CG1 CA HB CONECT CG1 4 CB HG1 HG1A HG1B CONECT CA 4 CB N C HA CONECT N 3 CA HN HNA CONECT C 3 CA O NAP CONECT O 1 C CONECT NAP 3 C SBD HNAP CONECT SBD 4 NAP OAF OAG O5' CONECT OAF 1 SBD CONECT OAG 1 SBD CONECT O5' 2 SBD C5' CONECT C5' 4 O5' C4' H5' H5'A CONECT C4' 4 C5' O4' C3' H4' CONECT O4' 2 C4' C1' CONECT C3' 4 C4' O3' C2' H3' CONECT O3' 2 C3' HO3' CONECT C2' 4 C3' O2' C1' H2' CONECT O2' 2 C2' HO2' CONECT C1' 4 O4' C2' N9 H1' CONECT N9 3 C4 C8 C1' CONECT N7 2 C5 C8 CONECT C2 3 N1 N3 H2 CONECT N6 3 C6 HN6 HN6A CONECT H8 1 C8 CONECT HG2 1 CG2 CONECT HG2A 1 CG2 CONECT HG2B 1 CG2 CONECT HB 1 CB CONECT HG1 1 CG1 CONECT HG1A 1 CG1 CONECT HG1B 1 CG1 CONECT HA 1 CA CONECT HN 1 N CONECT HNA 1 N CONECT HNAP 1 NAP CONECT H5' 1 C5' CONECT H5'A 1 C5' CONECT H4' 1 C4' CONECT H3' 1 C3' CONECT HO3' 1 O3' CONECT H2' 1 C2' CONECT HO2' 1 O2' CONECT H1' 1 C1' CONECT H2 1 C2 CONECT HN6 1 N6 CONECT HN6A 1 N6 END HET 54H 53 HETSYN 54H 5'-O-(3-Methyl-2-aminobutyrylsulfamoyl) adenosine HETNAM 54H 5'-O-(D-valylsulfamoyl)adenosine FORMUL 54H C15 H23 N7 O7 S1