RESIDUE 56B 57 CONECT N9 3 C1' C8 C4 CONECT C2' 4 O2' C1' C3' H1 CONECT O2' 2 C2' H2 CONECT P 4 O5' OP2 OP1 OP3 CONECT C1' 4 N9 C2' O4' H3 CONECT N10 3 C9 C10 H4 CONECT O11 2 C11 H6 CONECT C8 3 N9 C7 H7 CONECT N3 2 C4 C2 CONECT O12 2 C12 H8 CONECT C7 3 C8 C9 C5 CONECT N2 3 C2 H9 H10 CONECT O6 1 C6 CONECT C9 4 N10 C7 H11 H12 CONECT N1 3 C2 C6 H13 CONECT O4' 2 C1' C4' CONECT C10 4 N10 C11 C14 H14 CONECT O5' 2 P C5' CONECT C11 4 O11 C10 C12 H15 CONECT OP2 2 P H16 CONECT C12 4 O12 C11 C13 H17 CONECT C13 3 C12 C14 H18 CONECT OP1 1 P CONECT C14 3 C10 C13 H21 CONECT O3' 2 C3' H23 CONECT C5 3 C7 C4 C6 CONECT C4 3 N9 N3 C5 CONECT C2 3 N3 N2 N1 CONECT C6 3 O6 N1 C5 CONECT C4' 4 O4' C5' C3' H24 CONECT C5' 4 O5' C4' H25 H26 CONECT C3' 4 C2' O3' C4' H27 CONECT H1 1 C2' CONECT H2 1 O2' CONECT H3 1 C1' CONECT H4 1 N10 CONECT H6 1 O11 CONECT H7 1 C8 CONECT H8 1 O12 CONECT H9 1 N2 CONECT H10 1 N2 CONECT H11 1 C9 CONECT H12 1 C9 CONECT H13 1 N1 CONECT H14 1 C10 CONECT H15 1 C11 CONECT H16 1 OP2 CONECT H17 1 C12 CONECT H18 1 C13 CONECT H21 1 C14 CONECT H23 1 O3' CONECT H24 1 C4' CONECT H25 1 C5' CONECT H26 1 C5' CONECT H27 1 C3' CONECT OP3 2 P HOP3 CONECT HOP3 1 OP3 END HET 56B 57 HETNAM 56B 2-amino-5-({[(1S,4S,5R)-4,5-dihydroxycyclopent-2-en-1-y HETNAM 2 56B l]amino}methyl)-7-(5-O-phosphono-beta-D-ribofuranosyl)- HETNAM 3 56B 3,7-dihydro-4H-pyrrolo[2,3-d]pyrimidin-4-one FORMUL 56B C17 H24 N5 O10 P1